}

    @asynccontextmanager
    async def router_lifespan(
        app: FastAPI,
    ) -> AsyncGenerator[Dict[str, Union[str, bool]], None]:
        yield {
            "router_specific": True,
            "overridden": "router",  # should override parent
        }

    router = APIRouter(lifespan=router_lifespan)
    app = FastAPI(lifespan=lifespan)
    app.include_router(router)