mc_rebalance_datapack/data/mc_rebalance/recipes/alternate/furnace_minecart.json

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "key": {
    "#": {
      "tag": "minecraft:stone_crafting_materials"
    },
    "U": {
      "item": "minecraft:minecart"
    }
  },
  "pattern": [
    "###",
    "#U#",
    "###"
  ],
  "result": {
    "item": "minecraft:furnace_minecart"
  },
  "show_notification": true
}