Blendshapes / morph targets

What has become of this feature? I have seen some people talk about it and using it, but haven’t found much documentation about this feature.

There is some information here stating it is working, but I can’t really wrap my head around it.

Has anyone made examples using this features? There is an official demo where a cube morphs to sphere, but seems that project is not public - https://playcanv.as/p/b0D0o51f/