GoogleSignIn - How to refresh the access token? Can't find anything on it in the docs

I've successfully integrated GoogleSignIn into my Android app, but after 1 hour, the access token expires. How do I refresh the token?

I've checked out the entire docs for GoogleSignIn but there's nothing on refreshing the accessToken

https://developers.google.com/identity/sign-in/android/start-integrating

I've also tried searching for a method that has something like ".refreshAccessToken()"

How do I refresh the token? Why is there nothing about it in the docs?

from GoogleSignIn - How to refresh the access token? Can't find anything on it in the docs