chromium/chrome/test/data/banners/manifest_with_screenshots.json

{
  "name": "PWA Bottom Sheet",
  "description": "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua",
  "screenshots": [
    {
      "src": "screenshot1-portrait.jpeg",
      "type": "image/jpeg",
      "sizes": "409x728",
      "form_factor": "narrow",
      "label": "a narrow screenshot"
    },
    {
      "src": "screenshot1.jpeg",
      "type": "image/jpeg",
      "sizes": "728x409",
      "form_factor": "wide",
      "label": "a wide screenshot"
    },
    {
      "src": "screenshot2.jpeg",
      "type": "image/jpeg",
      "sizes": "551x541"
    }
  ],
  "icons": [
    {
      "src": "image-512px.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "scope": ".",
  "start_url": "manifest_test_page_screenshots.html",
  "display": "standalone"
}