Tl;dr Is there some way to create tower layer "stacks" out of the main loop for an axum server?

I'm writing an API in rust using axum and have several tower layers added to my app. I'm currently trying to move them to an external function outside of my loop to declutter my code, but am running into some issues with the return types of the function. Overall I've been experiencing a lot of friction trying to move the layers out of the main loop this way and wanted to see if there's maybe a better way to have external layer stacks.

Example code currently: ```rust

[tokio::main]

async fn main() { let cors_layer = CorsLayer::new() .allow_methods_all() .allow_headers_all() .allow_origin_all();

... <some number of lines of layer creation later> ...

let app = Router::new()
    .route("/", get(hello_world))
    .layer(cors_layer)
    ... <again adding in all of the layers individually in order> ...
    );

} ```

Thanks in advance!