Scout/src/main/resources/data/scout/recipes/tanned_leather.json

{
  "type": "minecraft:campfire_cooking",
  "lib39:discovered_via": "minecraft:leather",
  "ingredient": {
    "tag": "c:leather"
  },
  "result": "scout:tanned_leather",
  "experience": 0,
  "cookingtime": 600
}