Dynamic DOF - Blueprint

I understand how to implement the autofocus effect in a blueprint, but I do not understand how to construct the blueprint such that it can be dragged-and-dropped onto a CineCamera Actor in the scene - a la Unity C# scripting - to add the effect.

How does the front end of the Blueprint flow need to change to accommodate this paradigm?

When I press simulate, the blueprint runs correctly in the preview window (bottom right), but not in the viewport window (cinematic). Why?

screenshot of blueprint (left) screenshot of editor (right)