I think OP wants authentication to services to happen via OAuth (or is it called something else), where you get redirected to a web interface, sign in with your Master password and grant the Gnome app access to the service. As opposed to having to create an app password in e.g. Google web interface and using that for the Gnome app
But I can’t see any mention of Nextcloud either…? I took your post to mean any of the available online accounts, as you’re didn’t mention one specifically. Google was just an example