There is no such thing in Unreal as far as I know. But to be honest, there is no need for this at all. If you want to call a function in another blueprint, just get a reference to it and call the function. How you get the reference is really up to you.
- For example, suppose you use LineTraceByChannel (raycast) and hit an actor. You can cast this actor into InteractableActorBP, if it succeeds you can drag out from the “As InteractableActorBP” and call the function or event you want. More info on casting]