How to pass objects between tauri and yew front-end

The Tauri docs say that a return value from a command handler can be of any type as long as it implements serde::Serialize.

As a very basic modification of the default tauri + yew example project I modified in my tauri application a plain String return type with a struct as follows:

#[derive(Serialize, Deserialize)]
struct Data {
    demo: String
}

so that the command becomes

#[tauri::command]
fn greet(name: &str) -> Data {
    Data{demo: "demo".to_owned()}
}

The yew front-end unfortunately seems to return None now where before the msg was successfully converted into a String:

 new_msg = invoke(
    "greet",
    to_value(&GreetArgs { name: &*name }).unwrap(),
 )
 .await;
 log(&new_msg.as_string().unwrap());