Hello, I was successfully able to set up the development environment for Joplin also been using the desktop version as well as the react native app. I also have fixed the bug https://github.com/laurent22/joplin/issues/2170 been waiting for your reply to send the PR.
I really like the idea of OCR support and would like to work on it. I have also tried the workaround tesseract library to find out how it extracts the text from the image. Please let me know your suggestion and request you to guide me for contributing to Joplin @CalebJohn