Okay, so I think - to sum it up again - this is already covered in those two existing feature requests, so please join in there:
And what is even greater: this is still possible right now - with the desktop app. (if you experience difficulties to do that, then please open a new thread in the “Ask the Community” section to get some assistance for configuring that again)
And if you want it completely without the desktop app, then here again the existing feature request for that: Browser extension: Biometric authentication without desktop app