mpdf support

hello and thanks for the huge work!

is there any plan to support mpdf writer just like what's donw for [PHPWord](https://github.com/PHPOffice/PHPWord/blob/master/src/PhpWord/Writer/PDF/MPDF.php) and [PhpSpreadsheet](https://github.com/PHPOffice/PhpSpreadsheet/blob/master/src/PhpSpreadsheet/Writer/Pdf/Mpdf.php) ? 