Add social authentication in the flutter app without using the universal login

I am trying to add Authentication in my flutter app without using the universal login. I am using my custom UI of my flutter app and NodeJS as a backend. so far I achieved login with email and password, reset password, verify email etc. using the NodeJS API that uses auth0 NodeJS package and now I want to add social Signin like Google, Facebook etc to my flutter app and connect them with auth0 though by NodeJS backend if required.