This is a case use tranposing each data row from vertical columns to horizontal rows. You could use the Map process for it like this:

->pipe(new \koolreport\processes\Map(array(
    "{value}" => function($row) {
        $newRows = [];
        foreach ($row as $columnName => $value) {
            $horizontalRow = [
                "field" => $columnName,
                "value" => $value,
            ];
            array_push($newRows, $horizontalRow);
        }
        return $newRows;
    }
)))
->pipe($this->dataStore("result"));

After the process your datastore "result" will be a table with 2 columns "field" and "value" with similar format to your screenshot. Rgds,