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

{
  "type": "minecraft:crafting_shaped",
  "key": {
    "#": {
      "item": "minecraft:popped_chorus_fruit"
    },
    "/": {
      "item": "minecraft:blaze_rod"
    }
  },
  "pattern": [
    "/",
    "#"
  ],
  "result": {
    "count": 4,
    "item": "minecraft:end_rod"
  }
}