epub 2 PDF conversion with OCR in PDF possible?

Hi folks,

is it somehow possible to convert an epub file to a PDF file were in the end I open up the pdf in a pdf reader on a tablet were I can than mark interesting sentences actively and save the file than.

To be able to mark sentences I need a PDF file which has these OCR done before.

I would be great if that would be possible somehow with Calibre.

Any hints?

Thanks in advance

Chris