Referencing across Blueprints

Hey guys,

in my scene I’ve got a Player Controller and an AI Controller of a character. I’d like to trigger a custom event of my AI controller (a simple AIMoveTo, first picture) for my possessed char via an InputAction in my Player Controller (pic 2). How do a get the cross reference to the char? I’ve done something like this for a different issue in C++ via pointer, but here I want to do it withing the BP.

138613-clickcontroller.jpg

Thanks in advance!