How to expose variables in an animation blueprint?

I have a control rig setup for a table with wheels (really exciting). I have controllers setup to the parent joint of each wheel. Now I am trying to use a visible float variable to control the y-axis rotation of each wheel. This way, the wheels will all rotate together off of the same float.

I have referenced the Control Rig inside of an animation blueprint. At that point I could expose the input of each transform and plug in a float variable for all 4 wheels. Everything works as expected, however now I can’t figure out how to access the variable outside of the control rig so that I can animate it in Sequencer. Ideally, I could treat this float like I would in a regular blueprint where I can adjust it in the Details panel as well as keyframe it in Sequencer.

I also tried to import the animation blueprint into a basic Actor Blueprint to see if I could override the control that way and expose the float in the Details Panel, as well as Sequencer. Any thoughts on how this could be done?