Convert web_sys::PostData to reqwest::multipart::Form

Question

I have a form with a file input (filename):

use yew::prelude::*;

html! {
  <form enctype={ "multipart/form-data" } onsubmit={ form_onsubmit }>
    <input type="file" name="filename">
    <button type="submit">Submit</button>      
  </form>
}

I am able to get the web_sys::FormData with this function:

use wasm_bindgen::JsCast;
use web_sys::{EventTarget, HtmlFormElement, FormData};
use gloo_console::debug;

let form_onsubmit = {
    Callback::from(move |event: SubmitEvent| {
        let target: Option<EventTarget> = event.target();
        debug!(target.clone());
        let form = target.and_then(|t| t.dyn_into::<HtmlFormElement>().ok());
        debug!(form.clone());

        if let Some(form) = form {
            let form_data = FormData::new_with_form(&form).expect("Expecting form data");
            debug!(form_data);

            //let form = reqwest::multipart::Form::new()
            //           .part(form_data.get("filename"))
        };

        event.prevent_default();
    })
};

Is there a way to convert the content of the web_sys::FormData to reqwest::multipart::Form?