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

{
  "type": "minecraft:smithing",
  "lib39:discovered_via": "minecraft:diamond",
  "base": {
    "item": "scout:pouch"
  },
  "addition": {
    "item": "minecraft:diamond"
  },
  "result": {
    "item": "scout:upgraded_pouch"
  }
}