I've managed to get BlendShapes working (Shape Keys in Blender, exported as .fbx) in a test. But the modifications I need to apply to the mesh are too complex to be made by moving Vertices by hand. So I need to use an armature. But by using armatures to pose the model in Blender prevents you from creating Shape Keys. (or I haven't found out how yet).
Because Lens Studio can "see" the Armatures in the model, I wanted to ask if and how I could use them in conjunction with facial expressions.
BTW: Although the "Face Expressions" template is nice, there's one important thing missing: explaining how to get them working. It took me 2 days to find out that "Blend Shapes" are "Shape Keys" in Blender. Would be nice if that was mentioned more prominently in the manual.