We are aware of the Google One Tap and have it on our to-do list to implement. We've been very busy with the Joomla 4 compatibility release and other updates that went into JFBConnect v9.
With that said, we are settling on updates for the next release and I've increased the priority in our issue tracker to make sure it gets proper investigation. We love hearing from users as that always guides our development.
Thanks!
Alex