Android Firebase how to add 'users' node

Question

I'm making a community app. I want the function. -> When user A blocks user B user A immediately can not see user B's posts and comments.

So I search for it. -> How to block users on Firebase in a social media app? for iOS

In this advice, I have to make data structure like this.

users:
uid1:
   my data: {
       // some stuff here
   }
uid2:
   my data: {
       // some stuff here
   }

I want to make my data structure like this. But I'm using google auth like this.

How can I copy this users info to the database structure? And can't firebase rules refer to screenshot's info?