If anyone needs it:
"assets/bundled/prefabs/autospawn/resource/loot/trash-pile-1.prefab":{"Enabled":true,"ItemList":{"black.raspberries":{"Max":100,"Min":1},"blueberries":{"Max":100,"Min":1}},"ItemsMax":2,"ItemsMin":2,"MaxBPs":0,"Scrap":0},​

And here you have the default values for the Ration Box.