Just add to the data folder and enable through Nexus Mod Manager
http://www.nexusmods.com/fallout4/mods/modmanager/?
This mod alters the default forms so removing or turning off the mod will revert values back to their original values.
Note: Settlers may need to be re-assigned after adding the mod, and may result in more idle farmers if you already had a reasonably high food value. The amount that each settler can gather is still capped at 6 food, this just allows you to reach those caps with fewer plants or without subsisting solely on mutfruit.