venv/share/jupyter/lab/schemas/@jupyter-notebook/notebook-extension/edit-notebook-metadata.json

{
  "title": "Jupyter Notebook Menu Entries",
  "description": "Jupyter Notebook Menu Entries",
  "jupyter.lab.menus": {
    "main": [
      {
        "id": "jp-mainmenu-edit",
        "items": [
          {
            "type": "separator",
            "rank": 8.5
          },
          {
            "command": "notebook:edit-metadata",
            "rank": 8.5
          },
          {
            "type": "separator",
            "rank": 8.5
          }
        ]
      }
    ]
  },
  "properties": {},
  "additionalProperties": false,
  "type": "object"
}