I set up Google SDK to use Google API with Application Default Credentials. For my local machine, created a credentials json file and set its path as GOOGLE_APPLICATIO
It is possible now. Your instance must be stopped and then it can have its scope list changed from the console in the edit vm page, or in the SDK by using :
gcloud compute instances stop [vmname]
gcloud beta compute instances set-scopes [vmname] --scopes="[scopes list]"
Just be aware that with the SDK way, the second command will reset with the scopes in the list. It is not currently available the ability to only append a new scope.