@gedankenstuecke I don't know a way to copy text from the camera stream without Google Lense. For copying text from a photo, you can use the Google Photos app. It doesn't seem to send the text to Google's servers, but if you want to make sure, install NetGuard to block internet access for the app.
To create PDF documents with OCR, I use OSS Document Scanner
https://apt.izzysoft.de/fdroid/index/apk/com.akylas.documentscanner
