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

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "key": {
    "#": {
      "tag": "minecraft:logs"
    },
    "X": {
      "item": "minecraft:furnace"
    }
  },
  "pattern": [
    " # ",
    "#X#",
    " # "
  ],
  "result": {
    "item": "minecraft:smoker"
  }
}