Dynamically add AnimationState to Controller

I haven't been able to figure out how to programmatically add a new animation state to a runtimeAnimatorController. My end goal is to add additional AnimationClip slots to the controller at run time. I have been able to use the AnimatorOverrideController class to override existing AnimationClips; however, this doesn't work if you need to create additional "originals".

There is very little, if any, documentation on the subject so reaching out to the community for assistance. Thanks!