Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General Request: tutorial for modding base game

They can be edited if you right click one of the entries > Override in YOUR MOD HERE

Then it copies the entry to your mod and you can change the values at will.

You can do it in an add on with story as the target as you asked earlier.