I've been using Joplin for a few months and really loving it. I am currently using iOS app, Desktop (Linux), and CLI (Linux) of Joplin.
In the Apple Notes app there is a great feature "Scan Text", which allows you to scan in text via the camera. It works really well. Notes--> Camera icon --> Scan Text. (I wanted to post an image but can only post one image)
My understanding is this uses
DataScannerViewController. I am not sure if this is exposed to React Native. I don't have a Mac to try this out, but I think it would be a great feature.
I have tried the OCR plugin and honestly it doesn't get the best results.
In the meantime I created an iOS shortcut to take a picture, convert to text, and open the share pane.