Checkov - checking array values within an attribute

Question

I am looking for the operator logic to check values in an array (terraform) - has anyone tackled a similar problem and has a solution?

the resource is like this

resource "google_project_iam_binding" "my_project_iam_bigquery_dataviewer" {
  provider = google.my-project
  project  = "my-project"
  role     = "roles/bigquery.admin"
  members = [
    "group:[email protected]",
    "group:[email protected]"
  ]

}

I have tried adding a * (like with lists) to the attribute but - without success

        - cond_type: "attribute"
          resource_types:
            - "google_project_iam_member"
            - "google_project_iam_binding"
          attribute: "members.*"
          operator: "starting_with"
          value: "group"

otherwise, my thoughts of an operator that knows to iterate over the array

        - cond_type: "attribute"
          resource_types:
            - "google_project_iam_member"
            - "google_project_iam_binding"
          attribute: "members"
          operator: "iterate_array.starting_with"
          value: "group"

edit: this is how the python custom policy checks each value of the members array: https://github.com/bridgecrewio/checkov/blob/HEAD/checkov/terraform/checks/resource/gcp/ArtifactRegistryPrivateRepo.py#L34-L42

for context. If I was to check the value of an attribute that isn't an array i.e. member in a resource:

resource "google_project_iam_binding" "my_project_iam_bigquery_dataviewer" {
  provider = google.my-project
  project  = "my-project"
  role     = "roles/bigquery.admin"
  member = "group:[email protected]"
}

I can (and do) use this yaml

        - cond_type: "attribute"
          resource_types:
            - "google_project_iam_member"
            - "google_project_iam_binding"
          attribute: "member"
          operator: "starting_with"
          value: "group"

I cannot find a way to do the same check for members