How can I show a progress indicator for uploading a file using Nuxt3 built-in $fetch (ohmyfetch)?

Nuxt3 documentation suggests using its built-in $fetch method for making API calls. I'm trying to show the upload progress for a file uploader. I've done it with Axios before, but it does not work with the $fetch method. Here is my code which works with Axios:

//...
const config = {
  onUploadProgress: (progressEvent) => {
    progress.value = Math.round((progressEvent.loaded / progressEvent.total)*100);
  }
}

$fetch('/portfolio/upload/', {method: 'POST', body: formdata, config});
//...

I've looked into the ohmyfetch documentation on GitHub, but I did not find anything. Any idea about how can I handle upload progress using the $fetch method?