This post inspired me to repost [1] my side project that I open sourced as a PoC a while ago. I saw "note-taking" in the title and my project allows the type of note-taking that I envision should happen a bit more often (using a stylus).

The code is open-source, so I invite the co-founders of Grain to take a look and see if the idea might be useful to them :)

[1] https://news.ycombinator.com/item?id=22896157