How to receive User Metadata using /userinfo api?

I have been trying to send user metadata using rules or scopes or whatever it is using /userinfo api. But I couldn’t. I would like to add other info like app_metadata in future. Can anyone suggest a way about how to achieve this? Thanks in advance.

I have been going going through docs for the past week and all I see is being pointed out in circles. All I see is A → B → C → D → No where. I couldn’t figure out using these Auth0 Docs. Can anyone please explain in laymen terms please? (No scopes, claims, Rules or any of that fuss)

And By the way I am using Angular for FrontEnd, Node Js as Backend, Access Token for UserInfo Api