Pie menu variable in an actor Blueprint

Hi, I have a pie menu (the one from marketplace) and instead of changing the color of the ammo i would like to change a material of an static mesh in my map via a blueprint.

Is there a way to get one variable into my actor blueprint (in this case the variable is called selection).

I look it up and try to find an answer but all i could find is how to get a variable from a actor blueprint into the level blueprint.

Any suggestions or solutions are welcome!