Social Sign-In with Native log-in

Sorry I should have been clearer earlier.

This is building a native login as opposed to using Auth0 Universal Login

We have implemented the following documentation for Log-In as per the relevant section in this documentation, however we cannot find how we implement Sign-Up through Social connection?

ie How would a user create an account using Google Log-In, which is possible currently on Auth0 Universal Login

https://auth0.com/docs/api/authentication