This Unreal 5.3 Gameplay Ability System video is about adding a set of Flat Damage Upgrade Cards.
We start by adding the Damage Card entries to the Enum, and then we update the Map variables in the Game Instance Blueprint, mostly correctly. Next, the Award Upgrade function is updated to include the values for the Damage Upgrades, and lastly, we show an example of using an Instant Gameplay Effect with our Weapon swapping system Overriding that value and change it to an Infinite Gameplay Effect.
https://dev.epicgames.com/community/learning/tutorials/Gpod/unreal-engine-37-player-progression-upgrade-system-damage-let-s-make-a-top-down-shooter