tools/devshell/contrib/dart-tunnel-lib/package_config.json

{
    "configVersion": 2,
    "packages": [
        {
            "languageVersion": "2.12",
            "name": "fuchsia_remote_debug_protocol",
            "packageUri": "lib",
            "rootUri": "../../../../third_party/dart-pkg/git/flutter/packages/fuchsia_remote_debug_protocol"
        }
    ]
}