From my experience, you can’t. If possible, try to store the variable in the game mode blueprint instead, then call from that blueprint. An example is what I used to track how many bullets have been fired in a bullet hell game.
https://puu.sh/tpJWb/5ba14d3a84.png
If you call this from your blueprint it should work? (BulletHell is just the name of my game mode)
In your case you should get a boolean instead of an integer, but it’s basically the same thing.