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

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "key": {
    "#": {
      "item": "minecraft:obsidian"
    },
    "B": {
      "item": "minecraft:book"
    },
    "D": {
      "item": "minecraft:diamond"
    }
  },
  "pattern": [
    " B ",
    "D#D",
    "###"
  ],
  "result": {
    "count": 1,
    "id": "minecraft:enchanting_table"
  }
}