Global variable character blueprint

Can I somehow get the value of a gloabal variable in my charater blue print. The idea is to make a box if im standing on it make me jump higher. But I dont know how to make my bool that I made in a blueprint, usable in my character blueprint.

(Sorry for bad English)

Add a boolean variable to your character blueprint, instead of your Ugrató Actor.
And set the bool value to true when the player overlaps.

Something like this:

Of course use an another variable created by you.