gistfile1.txt

    "functions": [
        {
            "namespace": "rg",
            "members": {
                "prefix": {
                    "parameters": [
                        {"name": "name", "type": "string"}
                    ],
                    "output": {
                        "type": "string",
                        "value": "[concat(deployment().properties.parameters.stage.value, '-panda-', parameters('name'))]"
                    }
                }
            }

        }
    ],