Control niagara particle parameters via BP

I saw a video which used user exposed parameter in niagara and then accessed those parameters in blueprints.

But that method first drags a niagara system in the level and then uses level blueprint to get access to that specific niagara system.

But i am playing a niagara system in a montage and would like to be able to control the particle velocity, location, etc for the system playing IN THE MONTAGE and NOT one just placed inside the level.

Any thoughts on how to get access?