Unpacker / D:OS engine question:

I want to make balance adjustments to the files that unpack from Main into Public\Main\Stats... how do I get the game engine to them consume those changes. Do I need a re-packer? Can I just drop the raw changed file into Mods\%myMod%\Stats? Do I need to ingest the modded file into a mod via the edtiro some how? Thanks to anyone who has experience modding Larian games.