One more question then: Is there a format or way to save a screen-cap of text that will render it searchable?

Might be easier to photo it and use lens or such on photo?

I think if you want to do it from a screen shot then you'd need an OCR program.

You don't, because PDF is actually a picture generally speaking, even if it only contains text. There are exceptions to the rule I suppose, but the way to extract text from a picture requires a method to do so, and it is called OCR "scanning", it interprets text in pictures and can translate this into actual real plain text. The technique has its origin in OCR scanning, to be able to scan pages of written text from paper and have this saved as a text document on a computer.

There are probably many OCR functions available in GNU/Linux.
https://www.baeldung.com/linux/ocr-tools

Just came across this, and it reminded me of you and this thread. Might be of help: https://flathub.org/apps/com.github.tenderowl.frog

With linux(=tesseract) you'll need at least 400dpi for decent results. It's best to paste into a doc and insert an 'edit' stage. There's always some character that isn't interpreted correctly.