Perhaps this can help.
How to Import the iTunes Music Library to your TRAKTOR Track Collection – Native Instruments (native-instruments.com)
Let me know if it helped or if you need more info.
Hmm...wait...when you said that you want to get Apple Music in Traktor 3, do you mean that you want to install the music and then insert it into Traktor or just to drag the already existing Apple audio into the software?
Sorry if I didn't understand the context of the isssue...
What happened when you literally dragged the track or the playlist into Traktor?
Did you try it?
And if you did, was there an error or something?
Hmm...yeah...
Maybe @lord-carlos can help with this one.
Your issue will eventually be solved, no worries?
I didn't really succeded in helping you...but...no problem...
First of all, Traktor LE stands for Light Edition. I don´t know if this version supports Apple's music.app´s new library. Traktor PRO does for sure work with the new music.app.
Secondly, Traktor works with Apple´s music.app when it´s used to manage your own and local files. Traktor does NOT work with Apple Music´s streaming service. People are often confused by this.
So, if you are managing your mp3s/AACs in music.app, you can create an xml-file of your library. Go into Music.app -> File -> library -> export library (as xml-file).
Now go into Traktor settings -> file management -> directories and point the path to the xml-file created with music.app.