Is there a way to specify the filenames that are generated when a user exports data from a datagrid/datatable or when a user downloads a file from the ApexCharts download menu?

To specify the file name that is generated when a user downloads a file from the ApexCharts download menu, you do the following:

    "options" => [
                'chart' => [
                    'toolbar' => [
                        'export' => [
                            'csv' => [
                                'filename' => 'custom_filename'
                            ],
                            'svg' => [
                                'filename' => 'custom_filename'
                            ],
                            'png' => [
                                'filename' => 'custom_filename'
                            ]
                        ]
                    ]
                ]
            ],