{
  "items": [
    {
      "label": "Level 1",
      "icon": "chromium-browser",
      "items": [
        {
          "label": "Level 2-1",
          "icon": "chromium-browser",
          "items": [
            {
              "label": "Chromium Browser 1",
              "icon": "chromium-browser",
              "exec": "/usr/bin/chromium-browser"
            }
          ]
        },
        {
          "label": "Level 2-2",
          "icon": "chromium-browser",
          "items": [
            {
              "label": "Level 3-1",
              "icon": "chromium-browser",
              "items": [
                {
                  "label": "Chromium Browser 2",
                  "icon": "chromium-browser",
                  "exec": "/usr/bin/chromium-browser"
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}