Document signing with ink drawing or image signature insertion
The macOS PDF viewer can save your signature so you can easily insert it into any document: https://www.imore.com/how-sign-documents-your-mac-your-iphone-or-ipad
It'd be cool to do something similar, maybe with the ability to import photos of your signature since we can't do the fancy "connect to your phone" thing macOS has :)
cc @jimmac
Relevant mockups: https://gitlab.gnome.org/Teams/Design/app-mockups/-/blob/master/document-viewer/document-signing.png
Edited by Jeff Fortin