MamoWorld produce a Affter Effects plugin that created a lip synced mouth from a simple draw line.
Check out this link... I think it will be self explanatory.
I think if Adobe's Character Animator Team could build something similar to this idea inside Ch, it would make it accessible to far more users and make Ch more flexible for those already using it.
Any photo, or image would could have a simple line drawn on it and turned into a lip synced mouth.