It is probably not quite the answer you are looking for, but Mendix does have very good export to Excel support. Can you skip the PDF generation, and just export Excel from your application?
https://docs.mendix.com/howto/integration/using-the-excel-exporter/
Hi,
Try to convert pdf to excel via cutom Java action.
Take a look at the below link for convesion of pdf to excel
https://stackoverflow.com/questions/49314190/convert-pdf-to-excel-in-java
Hope it helps!!!