bin/fonts/manifest_minimal.json

{
  "families": [
    {
      "family": "Material Icons",
      "aliases": ["MaterialIcons"],
      "fallback": true,
      "fonts": [
        {
          "asset": "fonts/MaterialIcons-Regular.ttf",
        }
      ]
    },
    {
      "family": "Roboto",
      "fallback": true,
      "fonts": [
        {
          "asset": "fonts/Roboto-Regular.ttf"
        },
        {
          "asset": "fonts/Roboto-Light.ttf",
          "weight": 300
        },
        {
          "asset": "fonts/Roboto-Medium.ttf",
          "weight": 500
        }
      ]
    }
  ]
}