minecraft-assets/data/minecraft/recipes/green_terracotta.json

{
  "type": "crafting_shaped",
  "group": "stained_terracotta",
  "pattern": [
    "###",
    "#X#",
    "###"
  ],
  "key": {
    "#": {
      "item": "minecraft:terracotta"
    },
    "X": {
      "item": "minecraft:green_dye"
    }
  },
  "result": {
    "item": "minecraft:green_terracotta",
    "count": 8
  }
}