Adding an OpenLDAP group to Rancher?

In an earlier forum post, “How to mapping Rancher environment roles and ldap groups”, Vincent said that we can add OpenLDAP groups to Rancher:

If groups are configured correctly in the openldap config then you can add a group (not just an individual user) as a member of an environment and all members of that group will be able to use it.

How would one “Add a group” as a member of the environment? I’m pretty sure our groups follow the PosixGroup standard, and I cannot add a group, although I can add individuals.

Does Rancher try to enumerate a group? Should the group appear under ?