Blender 2.83 has a new feature called Face Sets which I already explained in a previous tutorial but now these face sets can be used with the Pose Brush to define the rotation's origin (pivot).

I show this for a low poly character that I pose using the Pose brush and face sets without rigging the character.

It's a great feature and a new use-case for face sets, it is included in the latest Blender experimental version (2.83) that you can download from here:
https://builder.blender.org/download/

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