Custom uv offset instance buffer attribute that targets only uv2?

Regarding https://www.babylonjs-playground.com/#64K1I1#2

Is it possible to target only one set of UVs with this technique?

cc @sebavan @Evgeni_Popov

What do you mean exactly by “one set of UV”?

In the example, there’s the regular uv set that is used to texture the cube, then a custom attribute uvc to add an offset to the texture coordinates for each instance.