Google Auth in Realm Cloud

I’ve signed into Google and retrieved my user. I’m ready to send my token to my Realm Cloud instance. I’m on the Authentication page of my Realm Cloud dashboard. I’ve got the JWT tab open.

And I have no idea what the heck to do now. Googling around isn’t helping because I don’t know precisely what I’m looking for.

Please help!

Edit: seems to indicate that Realm Cloud cannot use Google or Facebook authentication? That seems crazy.
BUT, that’s actually sort of okay with me, since once I get a SyncUser I “convert” them an object of my custom class YpbUser for my app’s purposes. If I’m storing all the user’s actual usable info in my realm as a YpbUser object, can I just use an Anonymous SyncUser authentication?