Retargeting animation at real time feature

Hi,

I am pretty sure that I have seen some kind of real time retargeting animation new feature in Unity but can't remember where I saw it.
At certain point I am trying to replicate animation at runtime between humanoid skeleton characters of different sizes, but not using duplicate animator because there's IK and other stuff going on.
Perhaps I didn't see that feature and it's just wishful thinking.

Thanks for advance.