If you only want a single vlan on it then it would use whatever vlan the switch has the port set to. If you want multiple vlans then in addition to supporting vlans it must support vlan tags/trunking. The orbi is targeted at the consumer market where people just want to plug in some magic box, complexity like vlans would hurt their little brains.
The unifi ap and their free controller software is much closer to a enterprise product. It support vlans and much more.
Now if your goal is to use the wireless repeater that I never looked into. I suspect there is no way to pass the vlan tags over a radio link. It already uses a hack called WDS to allow multiple mac addresses. Now you have mulitple vlans where the same mac can be...