Running on Google Cloud SQL

We have been successfully using gh-ost with RDS for a few years and now we'd like to use it with an instance that is going to be running in Google Cloud SQL. The problem we're facing is that we can't find out if it's possible to enable binary logging on the replica, and we have had problems in the past in RDS when trying to migrate on master.

I did some searching on here and didn't find too much conversation on using gh-ost with GCP other than the --gcp flag. Could I get some more insight into what this does? Does it allow us to still use the replica even without the binary logging enabled?