need a new only mp3 audio download feature

[GreninjaServer]

I would like to request a new feature for the yt-dlp-gui application. It would be great to have an option to download audio in MP3 format at 320kbps, with an embedded thumbnail from the video. This feature would be very useful for users who want high-quality audio files with metadata included.

Feature:
Option to Download MP3 at 320kbps: Allow users to select an option to download audio in MP3 format with a bitrate of 320kbps.
Embed Thumbnail: Embed the video's thumbnail into the MP3 file as album art.