Other than something based on Tesseract, I don't see many FOSS options
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
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
👍
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