Embedded Ansible (Docker) and Custom Inventories?

I’ve got a collection of Ansible playbooks provided by a third party which make heavily of host level vars and host groups, i’m currently using the Docker variant of Embedded Ansible in my ManageIQ install (hammer-2) but I can’t seem to work out how to provide host group mapping.

I’m assuming i’d have to pass a custom inventory to the Order_Ansible_Playbook, but how would I go around in doing this?