In my paper journals (and in GoodNotes) I have various shorthand icons that I draw next to text (stars, hearts, tiny houses, etc.). It would be great if I could draw these icons into an "icon gallery" and then when I draw them onto a page they would be recognized and the page would be "tagged" with the icon so that I can quickly find it again.

And I totally get that training your recognition engine to identify arbitrary shapes is a much different beast than recognizing handwriting in general and this may not be technically feasible. But it would be awesome!