How to use RefCell?

[little frigate]

Here I want to set red cell value then return Boolean . How can I do that?

fn  myfn() {
        
       let mut is_logged: Rc<RefCell<bool>> = Rc::new(RefCell::new(false));
         spawn_local(async move {
         is_logged.set_value(serde_wasm_bindgen::from_value::<bool>(backend::is_logged().await).unwrap();)
        // });
        // *is_logged
    };

[coral perch]

What do you mean by "return book"? What is your goal here?

[little frigate]

Sorry I mean Boolean