How to set Vector Field parameter from Blueprint?

Hi, I want to change the vector field from which my Niagara emitter is sampling through blueprints and I can’t find any tutorials on it online. I also haven’t found any built in function to achieve this. I started looking at the source code for Unreal Engine to try to find how the “Set Int Parameter” node is defined in order to be able to create a custom node in c++ to achieve this but I can’t find the definition of the node either. Any help here would be greatly appreciated!