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Yes, it is possible to apply excel style for excel PivotTable. Here's its documentation and example code:
i use the following styling array:
$allStylesArray = [
    'font' => [
        'name' => 'Calibri', //'Verdana', 'Arial'
        'size' => 30,
        'bold' => true,
        'italic' => FALSE,
        'underline' => 'none', //'double', 'doubleAccounting', 'single', 'singleAccounting'
        'strikethrough' => FALSE,
        'superscript' => false,
        'subscript' => false,
        'color' => [
            'rgb' => '000000',
            'argb' => 'FF000000',
        ]
    ],
    'alignment' => [
        'horizontal' => 'general',//left, right, center, centerContinuous, justify, fill, distributed
        'vertical' => 'bottom',//top, center, justify, distributed
        'textRotation' => 0,
        'wrapText' => false,
        'shrinkToFit' => true,
        'indent' => 0,
        'readOrder' => 0,
    ],
    'borders' => [
        'allBorders' => [
            'borderStyle' => 'medium', //dashDot, dashDotDot, dashed, dotted, double, hair, medium, mediumDashDot, mediumDashDotDot, mediumDashed, slantDashDot, thick, thin
            'color' => [
                'rgb' => '808080',
                'argb' => 'FF808080',
            ]
        ],
        //left, right, bottom, diagonal, allBorders, outline, inside, vertical, horizontal
    ],
    'fill' => [
        'fillType' => 'none', //'solid', 'linear', 'path', 'darkDown', 'darkGray', 'darkGrid', 'darkHorizontal', 'darkTrellis', 'darkUp', 'darkVertical', 'gray0625', 'gray125', 'lightDown', 'lightGray', 'lightGrid', 'lightHorizontal', 'lightTrellis', 'lightUp', 'lightVertical', 'mediumGray'
        'rotation' => 90,
        'color' => [
            'rgb' => 'A0A0A0',
            'argb' => 'FFA0A0A0',
        ],
        'startColor' => [
            'rgb' => 'A0A0A0',
            'argb' => 'FFA0A0A0',
        ],
        'endColor' => [
            'argb' => 'FFFFFF',
            'argb' => 'FFFFFFFF',
        ],
    ],
];
$styleArray = [
    'font' => [
        'italic' => true,
        'color' => [
            'hex' => 'a83234',
        ]
    ],
];
but the exported file don't have any styling:

i just need bordered table and column resize to fit the content.
here is the code:
<?php
    use \koolreport\excel\PivotTable;
    $sheet1 = "Finance Daily Report";
?>
<meta charset="UTF-8">
<meta name="title" content="Finance Daily Report">
<div sheet-name="<?php echo $sheet1; ?>">
    <?php
    $allStylesArray = [
        'font' => [
            'name' => 'Calibri', //'Verdana', 'Arial'
            'size' => 30,
            'bold' => true,
            'italic' => FALSE,
            'underline' => 'none', //'double', 'doubleAccounting', 'single', 'singleAccounting'
            'strikethrough' => FALSE,
            'superscript' => false,
            'subscript' => false,
            'color' => [
                'rgb' => '000000',
                'argb' => 'FF000000',
            ]
        ],
        'alignment' => [
            'horizontal' => 'general',//left, right, center, centerContinuous, justify, fill, distributed
            'vertical' => 'bottom',//top, center, justify, distributed
            'textRotation' => 0,
            'wrapText' => false,
            'shrinkToFit' => true,
            'indent' => 0,
            'readOrder' => 0,
        ],
        'borders' => [
            'allBorders' => [
                'borderStyle' => 'medium', //dashDot, dashDotDot, dashed, dotted, double, hair, medium, mediumDashDot, mediumDashDotDot, mediumDashed, slantDashDot, thick, thin
                'color' => [
                    'rgb' => '808080',
                    'argb' => 'FF808080',
                ]
            ],
            //left, right, bottom, diagonal, allBorders, outline, inside, vertical, horizontal
        ],
        'fill' => [
            'fillType' => 'none', //'solid', 'linear', 'path', 'darkDown', 'darkGray', 'darkGrid', 'darkHorizontal', 'darkTrellis', 'darkUp', 'darkVertical', 'gray0625', 'gray125', 'lightDown', 'lightGray', 'lightGrid', 'lightHorizontal', 'lightTrellis', 'lightUp', 'lightVertical', 'mediumGray'
            'rotation' => 90,
            'color' => [
                'rgb' => 'A0A0A0',
                'argb' => 'FFA0A0A0',
            ],
            'startColor' => [
                'rgb' => 'A0A0A0',
                'argb' => 'FFA0A0A0',
            ],
            'endColor' => [
                'argb' => 'FFFFFF',
                'argb' => 'FFFFFFFF',
            ],
        ],
    ];
    $styleArray = [
        'font' => [
            'italic' => true,
            'color' => [
                'hex' => 'a83234',
            ]
        ],
    ];
    ?>
    <div>Finance Daily Report</div>
    <div>
        <?php
        PivotTable::create(array(
                "dataSource" => $this->dataStore('FNAFAD0001_100'),
                "rowDimension"=>"row",
                "columnDimension"=>"column",
                "measures"=>[
                    "Beginning Balance - sum",
                    "Debit - sum",
                    "Credit - sum",
                    "Last Balance - sum",            
                ],
                "headerMap"=>[
                    "Beginning Balance - sum"=>"Beginning Balance",
                    "Debit - sum"=>"Debit",
                    "Credit - sum"=>"Credit",
                    "Last Balance - sum"=>"Last Balance",
                ],
                "hideSubtotalRow"=>true,
                "showDataHeaders" => true,
                'map' => array(
                    'rowField' => function($rowField, $fieldInfo) {
                        return $rowField;
                    },
                    'columnField' => function($colField, $fieldInfo) {
                        return $colField;
                    },
                    'dataField' => function($dataField, $fieldInfo) {
                        $v = $dataField;
                    },
                    'waitingField' => function($waitingField, $fieldInfo) {
                        return $waitingField;
                    },
                    'rowHeader' => function($rowHeader, $headerInfo) {
                        $v = $rowHeader;
                        return $v;
                    },
                    'columnHeader' => function($colHeader, $headerInfo) {
                        $v = $colHeader;
                        return $v;
                    },
                    'dataCell' => function($value, $cellInfo) {
                        return $value;
                    },
                ),
                'excelStyle' => array(
                    'dataField' => function($dataFields) use ($allStylesArray) {
                        return $allStylesArray;
                    },
                    'dataHeader' => function($dataFields, $fieldInfo) use ($allStylesArray) {
                        return $allStylesArray;
                    },
                    'columnHeader' => function($header, $headerInfo) use ($allStylesArray) {
                        return $allStylesArray;
                    },
                    'rowHeader' => function($header, $headerInfo) use ($allStylesArray) {
                        return $allStylesArray;
                    },
                    'dataCell' => function($value, $cellInfo) use ($allStylesArray) {                    
                        return $allStylesArray;
                    },
                )
        ));
        ?>
    </div>
</div>
Pls try our standard example on your server:
https://www.koolreport.com/examples/reports/excel/pivottable/
See if the output excel file has PivotTable in italic font and gray color? If it does, pls copy and modify the example for your case. Tks,
Oh, I just realize you use these excel styles:
        'font' => [
            ...
            'italic' => FALSE,
            ...
            'color' => [
                'rgb' => '000000',
                'argb' => 'FF000000',
            ]
        ], 
Of course your excel output would not be in italic or gray color font. Pls stry these styles instead:
        'font' => [
            ...
            'italic' => true,
            ...
            'color' => [
                'rgb' => '808080',
            ]
        ], 
it doesn't work. here is the properties that i use:
$allStylesArray = [
        'font' => [
            'name' => 'Calibri', //'Verdana', 'Arial'
            'size' => 30,
            'bold' => true,
            'italic' => true,
            'underline' => 'none', //'double', 'doubleAccounting', 'single', 'singleAccounting'
            'strikethrough' => FALSE,
            'superscript' => false,
            'subscript' => false,
            'color' => [
                'rgb' => '808080'
            ]
        ],
        'alignment' => [
            'horizontal' => 'general',//left, right, center, centerContinuous, justify, fill, distributed
            'vertical' => 'bottom',//top, center, justify, distributed
            'textRotation' => 0,
            'wrapText' => false,
            'shrinkToFit' => true,
            'indent' => 0,
            'readOrder' => 0,
        ],
        'borders' => [
            'allBorders' => [
                'borderStyle' => 'medium', //dashDot, dashDotDot, dashed, dotted, double, hair, medium, mediumDashDot, mediumDashDotDot, mediumDashed, slantDashDot, thick, thin
                'color' => [
                    'rgb' => '808080'
                ]
            ],
            //left, right, bottom, diagonal, allBorders, outline, inside, vertical, horizontal
        ],
        'fill' => [
            'fillType' => 'none', //'solid', 'linear', 'path', 'darkDown', 'darkGray', 'darkGrid', 'darkHorizontal', 'darkTrellis', 'darkUp', 'darkVertical', 'gray0625', 'gray125', 'lightDown', 'lightGray', 'lightGrid', 'lightHorizontal', 'lightTrellis', 'lightUp', 'lightVertical', 'mediumGray'
            'rotation' => 90,
            'color' => [
                'rgb' => 'A0A0A0',
                'argb' => 'FFA0A0A0',
            ],
            'startColor' => [
                'rgb' => 'A0A0A0',
                'argb' => 'FFA0A0A0',
            ],
            'endColor' => [
                'argb' => 'FFFFFF',
                'argb' => 'FFFFFFFF',
            ],
        ],
    ];
    $styleArray = [
        'font' => [
            'italic' => true,
            'color' => [
                'rgb' => '808080',
            ]
        ],
    ];
the result:

hi, i already check the result using ms excel app. some of styling are applied. but i need to know one more thing.

how to apply alignment only on some cells or rows? i want to make the numeric cells aligned to right.
and how to place some blank rows or space between 2 tables?
The data cell numbers are right aligned by default. Which version of MS Excel are you using? Office 365 shows the numbers' right alignment ok.
To add spaces between 2 tables/pivottables you must use excel view file for exporting instead of exporting datastores directly.
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