Warning, I might be wrong:
yt-dlp seems to be operated with command lines, whereas cobalt is a user interface in an opened browser tab. You paste the link of the desired video or audio source into a search bar and you can toggle different settings (bitrate, file format, video output size etc.). The desired file will be appearing as a download into your download folder.
Yes, this would be an option (that I did not think of). But I assume that it would be easier to download the same file in another file format, as there will be probably an improvement regarding the video resolution (480p versus 1080p or higher).