How to grant user readonly access to GCS bucket folder via Deployment Manager

Question

I am trying to grant user readonly permission on bucket with IAM condition , although i am able to do this via terraform/console but via Deployment manager its creating a user permission but not allowing me to set condition. I am using this example from GCP https://github.com/GoogleCloudPlatform/cloud-foundation-toolkit/blob/master/dm/templates/iam_member/examples/iam_member_resource.yaml. also when i grant user read access only on specific folder , user not able to list any objects in bucket in the folder ,for this i have to grant list object on all folders and read access to single folder

I tried to add IAM condition via deployment manager on gcs bucket , it should add it but its not working