Processed-obsidian/src/main/resources/data/processed_obsidian/recipe/obsidian_chestplate.json

{
  "type": "minecraft:smithing_transform",
  "group": "processed_obsidian",
  "addition": {
    "item": "processed_obsidian:obsidian_alloy"
  },
  "base": {
    "item": "minecraft:netherite_chestplate"
  },
  "result": {
    "count": 1,
    "id": "processed_obsidian:obsidian_chestplate"
  },
  "template": {
    "item": "processed_obsidian:obsidian_upgrade_smithing_template"
  }
}