It kind of depends on your goal.
If you want a record of something, and don’t need to develop it further with more thought, then some sort of OCR would probably be the way to go. See arrodick’s post about Prizmo Go, which I haven’t tried.
If you need to think about your notes further, develop ideas, arguments, etc. then I would suggest rewriting them into something like Obsidian yourself, thinking about them and forming more complete thoughts. This will give you another exposure to the material and help with (your) retention, creating new ideas and making connections.
Bryan Jenks has good videos on using Obsidian, but the concepts could be applied to other tools.
