He should just use the GameState class for this. This class is designed to contain information about the state of the Game and it is reseted for each level.
If he wants to provide level specific information, then he can get the GameState in the LevelBlueprint and set different values.
The GameState can be accessed easily by just searching for “GameState” in a graph. You can create our own GameState Blueprint and set it in the Maps and Nodes or in the Default Settings of you GameMode Blueprint.
You can also have a look at the PlayerState class. You can create your own and set it inside the GameMode Blueprint Default settings (only there. not in the maps and nodes). The GameState contains an array of all PlayerStates if you are running a MultiplayerGame.