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

{
  "type": "minecraft:stonecutting",
  "ingredient": {
    "item": "minecraft:cobbled_deepslate"
  },
  "result": {
    "count": 1,
    "id": "minecraft:chiseled_deepslate"
  }
}