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in game interface like UE4 Blueprint - how to ?

I like to create a in-game interface where you connect wires like in UE4 Blueprints.
Assumingly, a start would be in Paper 2D?, perhaps even 3D (I would prefer the 3D version if possible) .
I don’t know how to go about it, though. Any help is highly appreciated.

There is a lot of stuff to take in consideration here What do you want your interface to do?