minecraft-assets/assets/minecraft/recipes/red_dye_from_rose_bush.json

{
  "type": "crafting_shapeless",
  "group": "red_dye",
  "ingredients": [
    {
      "item": "minecraft:double_plant",
      "data": 4
    }
  ],
  "result": {
    "item": "minecraft:dye",
    "data": 1,
    "count": 2
  }
}