Other than something based on Tesseract, I don't see many FOSS options
I personally use OSS Document Scanner.
It has different dictionaries, can scan docs/papers and archive them. Can also translate and extract text (to an extent). It works great for my needs, hopefully it is what you were looking for too
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I use PDF converter by Swati Garg on F-droid
How?
I click the button that says "images to PDF"
This is not a proper solution, but if you can't find an alternative that fills your need, you might try tracker control and use it to turn off internet access for google lens and see if it still works for your usecase. I think you have to search trackercontrol for it to show up on f-droid
Microsoft Lens? (Yes it's an Android app)
Not on F-droid as its proprietary and spyware
