jupyterlab/packages/apputils-extension/schema/workspaces.json

{
  "title": "Workspaces",
  "description": "Workspaces settings.",
  "jupyter.lab.menus": {
    "main": [
      {
        "id": "jp-mainmenu-file",
        "items": [
          {
            "command": "workspace-ui:save-as",
            "rank": 40
          },
          {
            "command": "workspace-ui:save",
            "rank": 40
          }
        ]
      }
    ]
  },
  "additionalProperties": false,
  "properties": {},
  "type": "object"
}