The UE5 Manny skeleton includes extra bones that are supposed to stretch the character’s skin when the limbs move. I understand that this is a procedural rigging feature and wondering how to apply this feature to a UE5 compatible skeleton that has all the needed bones. Thanks!
There is a post process AnimBP that manage all those extra joints, using a node called Pose Driver.
For each Pose Driver there is an animation sample, where the node reads poses based on joint angle, in order to understand how to move the extra joints.
If you want to have the same setup, you can either retarget all those animations that you already have on a Metahuman, or create new ones in your DCC.