I have been using LLMs for this and they excel and understanding my very poor calligraphy. All I do I take photos of the pages I wrote by hand, and then ask the LLM to convert those notes to markdown and convert any diagrams that I might have to mermaidjs style, and worked wonders for me.
Hmmm - I guess all the "chatbot" web interfaces for LLMs have an option to upload images. And they're really good at this now you say? That's a really useful tip; thanks.