<recipetype:create:filling>.addJSONRecipe("cobblestone",{
  "type": "create:filling",
  "ingredients": [
    {
      "item": "minecraft:magma_block"
    },
    {
      "fluid": "minecraft:water",
      "nbt": {},
      "amount": 1000
    }
  ],
  "results": [
    {
      "item": "minecraft:cobblestone"
    }
  ]
}
);
