rigging - Blend shapes, but for textures/decals? - Blender

I'm trying to understand how to rig a very simple figure/head with blend shapes to use through a animation framework in unity. Now I made the head so low poly that the actual facial features would

Danny Diaz - Game ready facial rig

11. Corrective Blendshapes – CAVE Academy

3 Important Ways to Incorporate Blend Shapes in a Rig - Lesterbanks

Blend shapes edit are ignored? : r/Maya

Introducing FaceFlex, an affordable and time-saving Blender addon designed for generating ARKit & Wonder Studio Blend Shapes for facial motion

FaceFlex - Blendshapes Generator for ARKit & Wonder Studio

Blendshape transformations not affected by weight paints - Animation and Rigging - Blender Artists Community

Adding decals to a procedural texture - Materials and Textures - Blender Artists Community

Standard Material 3D and ORM Material 3D — Godot Engine (stable) documentation in English

Blend shape help : r/Maya