minecraft-assets/data/minecraft/recipe/observer.json

{
  "type": "minecraft:crafting_shaped",
  "category": "redstone",
  "key": {
    "#": {
      "item": "minecraft:cobblestone"
    },
    "Q": {
      "item": "minecraft:quartz"
    },
    "R": {
      "item": "minecraft:redstone"
    }
  },
  "pattern": [
    "###",
    "RRQ",
    "###"
  ],
  "result": {
    "count": 1,
    "id": "minecraft:observer"
  }
}