Adding fog to areas that dont have it in the scene

Hello,

I am new to unreal and i am trying to use the exponential fog height feature.
I have a scene that has fog in it. part of the scene is a cave wich is far from the fog source. there is no fog in it
I want the fog to be present in the cave as well so i can add som nice light beams to enter it and show the fog…

Is there a simple way to do this or i need to programm it with blueprints ?

Thanks