Calling from external URLs is already a possibilty and are available for opening folders, tags and notes, but there's no way to create a note easily with the same method. In order to have an easier path for creating notes on mobile coming from other apps, is it complicated to expose something like below?
joplin://createNote?title=...&body=...¬ebook=...
If this URL scheme were already available, clipping from mobile could be much more straightforward.