I really like the "share secure link" to share credentials as I use it quite often to log into websites on virtual machines etc. However, you still need to type the shared link into the browser, which can be a bit tedious. The idea basically steals the philosophy behind OpenID Connect's device code flow to eliminate this step of manually typing the secure link's URL.

This would basically be an addition to the "share secure link functionality". You'd have a generic, easily-remembered proton pass webpage that displays a QR code. You can then scan this QR code with your phone where you have proton pass installed. Scanning the QR code opens proton pass and asks "which credentials would you like to share?". You then choose which one(s) you'd like to share, and they immediately get displayed on the webpage that was showing the qr code.