Sorry, that is not an option.
You can sync Desktop & documents and any folders and files within, but there is no option to select other folders to sync beyond those 2.
There is no point in syncing the physical media files to iCloud as the Music app can have issues when that happens if the files aren't available or the connection is severed for any reason. This will just cause more issues than it solves.
If you are using iCloud Music library, then your music is already available on all your other devices, so doubling it up in iCloud drive is unnecessary. Also note, the Music app on iPhone, iPad Apple Vision would be unable to access any music files in the iCloud Driver area, so you're left with a collection of music folders you need to manage yourself and no access from the Music app to play them.
For anything else you want to sync, you would need to copy or move the folders into the iCloud Drive folder in finder and then access those folders from there directly instead from your user profile's folders.