CC4 to Audio2Face to Blender pipeline. How do I animate the Jaw?

I am currently importing the blendeshapes into blender as Json, and transferring that to the original mesh (which works great!). Then I import the rig file usd for the eyes, tongue and lower dentures. I figured out a way to connect the eyes and tongue to the original mesh, but am at a loss for how to make the jaw move. I tried using the lower dentures to add constraints and drivers to the jaw bone, but nothing has worked so far. I’m hoping there is something obvious that I’m missing. Like a way to export something with a rotation value to use as a driver for the jaw bone rotation. Or Should I manually add an open-jaw shapekey to CC models and then import to audio2face? Pls help!!