How to Animate Group Layer Order with Smart Bone?

Hey folks,

I’m animating a head turn in Moho using Smart Bones. I have 3 group layers (hair pieces) with their own masking and shading. I want them to shift order (front to back) depending on head angle.

I’ve seen examples using Smart Bone Actions to animate Layer Order, but I don’t know how to access this. I only see Layer Order in the timeline if I move layers manually.

Can I keyframe group layer order with Smart Bones?