renewable-resources/data/renewable/recipe/netherrack_from_cobblestone.json

{
  "type": "minecraft:smelting",
  "category": "blocks",
  "ingredient": {
    "item": "minecraft:cobblestone"
  },
  "result": {
    "id": "minecraft:netherrack"
  },
  "experience": 0.1,
  "cooking_time": 200
}