Humanoid + fingers

I created a humanoid and imported into Unity. Set up the rig so the model appears to be working.
https://docs.unity3d.com/Manual/InverseKinematics.html

What about the fingers?
The humanoid rig setup has the fingers setup, but I don't see anyway to actually control them like the IK control for the arms, legs, and head.
Do I need to import the animations for the fingers, or is there some other tool or functionality I can use?
What is the purpose of configuring the humanoid to include the fingers?
Thanks

 

you can use humanPose
I think an example is here in the package

or you can have an animation layer for the hand fingers
and play animation for them