How to use CustomClass in GEEC(GameplayAbilitySystem)(UE5)

I am using GameplayAbilitySystem in UE5
It is possible to use CustomClass from the Modifiers tab, but I don’t really understand how to use CustomClass from the Execution tab.
I am currently implementing it in C++ as shown in the image, but this is different from what I want to do because it retrieves the value set in AttributeSet.
I don’t mind BP, so could you please tell me how to do it?