Add Spotify to list of supported download sites in YouTube to mp3

I know you can download tracks from SoundCloud using the YouTube to mp3 application, but what about Spotify? Would it be possible to add a feature that would allow me to download a track or tracks from Spotify, but without pulling the songs from outside sources or "recording" using a screen recording software, as many other so called Spotify "downloaders" do? (There are music albums I would like to download from Spotify that aren't available anywhere else)