lapp/static/manifest.json

{
  "name": "List App",
  "short_name": "L@pp",
  "start_url": "/",
  "display": "standalone",
  "background_color": "transparent",
  "theme_color": "transparent",
  "icons": [
    {
      "src": "/static/lapp192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "/static/lapp512.png",
      "sizes": "512x512",
      "type": "image/png"
    },
    {
      "src": "/static/lapp1024.png",
      "sizes": "1024x1024",
      "type": "image/png",
      "purpose": "maskable"
    }
  ]
}