Face rig setup

I want to use my rigged character in Unity for live streaming mocap data

I have a character that is rigged with a full joint based facial setup using set driven keys/expressions in Autodesk Maya to control the movement of the teeth when the lower jaw moves.

Set driven keys is a Maya specific function and will not export out and into Unity.

How do I rig the face to allow the lower teeth to move without having to use Maya specific functions?

NOTE: Using the morph-target/blendshape approach also requires the use of set driven keys/expressions to control the teeth movement