shell/platform/fuchsia/flutter/tests/test_manifest.json

{
    "families": [
        {
            "family": "Roboto",
            "fallback": true,
            "fallback_group": "sans-serif",
            "fonts": [
                {
                    "asset": "Roboto-Regular.ttf"
                }
            ]
        },
        {
            "family": "Roboto Slab",
            "aliases": [
                "RobotoSlab"
            ],
            "fallback": true,
            "fallback_group": "serif",
            "fonts": [
                {
                    "asset": "RobotoSlab-Regular.ttf"
                }
            ]
        }
    ]
}