>>296895421
baking AO in blender will give you things like hair casting shadow on the forehead, and shaded neck, and putting the texture in the proper AO slot for toon shaders will let it take effect according to your ramps or feathering settings.

Most common toon shaders (UTS, xiexe) will give you true self-shadowing (though not ambient occlusion), but only with realtime lights, which aren't common in vrchat due to the performance hit.