What exactly does this do please?

[GOvEy1nw]

Hey, apologies for the seemingly noob question, but I'm a little confused about what this does.

I thought, if I had a non-standard human character in CC4 with all ARKit blendshapes already applied, it would essentially remap those ARKit blendshapes to the CC4 Standard profile sliders as closely as it could, automatically. But when trying it out, it seems to just add a 'Custom' folder with all ARKit sliders.

Could you please clarify the use case for this?