As per https://docs.github.com/en/rest/reference/teams#add-or-update-team-repository-permissions - custom role names (https://docs.github.com/en/enterprise-cloud@latest/organizations/managing-peoples-access-to-your-organization-with-roles/managing-custom-repository-roles-for-an-organization) are now permitted when adding/updating permissions for teams.

The Terraform provider still only expects pull, triage, push, maintain, or admin

For the avoidance of doubt, I have tested setting permissions with a custom role name (it seems to be case sensitive) via the GH API and it works.

Would someone be so kind as to allow string values for the permission argument please?