Keepass that it is mentioned was like auto-type not what browser extension does.
This could inherently create some security issues I guess, so maybe this is why it is not there.
Unless the app can support it, which means that it would be easier to make it work for windows, Mac and then linux, or if the app is electron based maybe.
Just thinking out loud

I pay $15 a month for unlimited storage.

their plans go up to 2TB. Is this hidden?