Are there templates for face rigging design docks or examples?

I am learning rigging and want to rig my character.

But it’s hard for me to understand how complex and unique a face rig should be.

Maybe there is some kind of requirement template for a face rig that you can build on or a source where you can get acquainted with other people’s design documents for face rigging?

My character will be the same style as Rain or Snow from Blender Studio. Rig would like to do no worse than Rain and Snow.

I watched Snow’s rigging streams, but it’s hard to get any info from there. Therefore, I thought that maybe there is documentation that will help to figure it out.