Greetings. It looks like some of the markdown might be malformed here for "parent": https://cloud.google.com/python/docs/reference/iam/latest/google.cloud.iam_admin_v1.types.ListRolesRequest

Is there a way to filter the list of roles returned to just custom roles? Because all the official predefined roles already have documentation/are documented, it make sense to only list the custom roles to review the IAM permissions, but there did not seem to be that type of filter in the documentation? Would that be a feature request?