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

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "GGG",
    "GEG",
    "GTG"
  ],
  "key": {
    "T": {
      "item": "minecraft:ghast_tear"
    },
    "E": {
      "item": "minecraft:ender_eye"
    },
    "G": {
      "item": "minecraft:glass"
    }
  },
  "result": {
    "item": "minecraft:end_crystal"
  }
}