Search option to find text in PDF files

I’m trying to find a solution/add-on for Thunderbird to search also through content in PDF files. I can’t find e-mails right know with specific content in PDF files. So for example when I search for ordernummer 7014 as an example, that it finds this ordernumber in a PDF invoice of our supplier. I know this is possible within G-mail and Outlook, but was we recently moved to Thunderbird I’m trying to find a solution for this issue. Anyone can help me with this challenge?

@LotRtb thanks for the idea. Your issue is described at https://bugzilla.mozilla.org/show_bug.cgi?id=1806081

However, the best place for ideas is https://connect.mozilla.org/ where they can be voted on. I suggest you post there to get some fellow users to vote.