yield {"router": True}

    @asynccontextmanager
    async def sub_router_lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
        yield

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