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

{
  "type": "crafting_shapeless",
  "group": "magenta_dye",
  "ingredients": [
    {
      "item": "minecraft:allium"
    }
  ],
  "result": {
    "item": "minecraft:magenta_dye"
  }
}