members
Identities that will be granted the privilege in role. Each entry can have one of the following values:
user:{emailid}: An email address that represents a specific Google account. For example, alice@gmail.com or joe@example.com.
serviceAccount:{emailid}: An email address that represents a service account. For example, my-other-app@appspot.gserviceaccount.com.
group:{emailid}: An email address that represents a Google group. For example, admins@example.com.
domain:{domain}: A G Suite domain (primary, instead of alias) name that represents all the users of that domain. For example, google.com or example.com.