hub/web/static/manifest.webmanifest

{
  "icons": [
    {
      "purpose": "maskable",
      "sizes": "192x192",
      "src": "icon-192x192.png",
      "type": "image/png"
    },
    {
      "purpose": "maskable",
      "sizes": "512x512",
      "src": "icon-512x512.png",
      "type": "image/png"
    }
  ]
}