What is the syntax for adding a nbma neighbor via RADIUS on cisco?

Question

I should be able to use the Cisco-avpair attribute to create a OSPF nbma unicast neighbor at the time of creation of a virtual interface creation on a MlPPPoE session. What's the syntax for doing something like this? In effect, I want to add the config:

router ospf nn
  neighbor xx.xx.xx.xx priority 1 poll-interval 20
!

Via an attribute, probably along the lines of:

Cisco-AVpair += "router:ospf xx=neighbor xx.xx.xx.xx priority 1 poll-interval 20"