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

{
  "type": "minecraft:crafting_shaped",
  "category": "redstone",
  "key": {
    "#": "minecraft:cobblestone",
    "X": "minecraft:stick"
  },
  "pattern": [
    "X",
    "#"
  ],
  "result": {
    "count": 1,
    "id": "minecraft:lever"
  }
}