I wanted to share a gist with a python script but I'm not allowed to share links, what an anticlimax. I'll try an ugly one.
I just switched over all my note taking to Joplin and I love it. Previously I've used Evernote, but lately just the iOS built-in notes app. What a disappointment when I found that Notes only does PDF exports. I couldn't find any good way to do it, but then saw that you can sync notes to Gmail.
So here's my approach, a multi-step process with a python script at the end.
It's not perfect, Apple jumbles some notes in the sync with Gmail, but it worked for me.
I hope it can be of help to someone else.
Add notes sync to you gmail connection, giving you a Gmail section in the app.
Copy all your note folders into that Gmail space in Notes. Probably should be done on a computer.
Wait for all the notes to sync to Gmail.
Download all emails tagged with Notes with takeout[dot]google[dot]com
For each of the resulting mbox files, run this script with modified name and prefix.
Import the markdown folder (with front matter) into Joplin.
Thanks for your replies! I did search but never found your nice summary graphit0 before rolling my own solution. I also don't have an up-to-date Mac to use the exporter app. I just tried a data export from privacy dot apple dot com though, so I'll see what format they use in at most seven days.
A few days later, and my export is done. Unfortunately it's a dissapointing one - they've just converted everything to plain text files, all formatting gone and the images are in a separate folder for each note. My script, while not perfect, does a better job.