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

{
  "type": "minecraft:crafting_shaped",
  "category": "redstone",
  "key": {
    "#": {
      "item": "minecraft:stone"
    }
  },
  "pattern": [
    "##"
  ],
  "result": {
    "item": "minecraft:stone_pressure_plate"
  }
}