Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Scripting Mod Compatibility

You can use CharacterAddTreasureTable() within object scripts to add a single treasuretable entry--no root modifications needed.

There's also CharacterSetCustomTradeTreasure() in story code, but I am less-sure of its functionality.