Get Recently Played Resources: How to use the include= and extend= parameters?

Hey everyone - I'm playing with the Apple Music API, and am looking at using the Get Recently Played Resources endpoint to retrieve the recently played tracks, playlists, and so on for a given user.

One common scenario I see happening is the user starting to play a catalog playlist (eg. "Future Hits"); what I'd like to do is display to them the name of that playlist, and then the actual song that's being played. Currently, a call to that endpoint gives me information on the playlist, but nothing about what track is actually being played.

If this is possible to retrieve, my guess is it's via the include= or extend= , but I see no documentation about how to use these to get that added information. Does anyone know how/if that is possible?