Matinee data and spawned actors

I’ve got the hang of using creating InterpData objects to share Matinee data across actors, but I can’t seem to find a way to assign an actor to a given group via blueprint, like it was possible in Kismet in UE 3.

This means I am unable to have an actor spawned at runtime participate in a Matinee.

Have I missed something or is not possible (yet)?