Currently there are only a limited albums on Music has Dolby Atmos enhanced, but as what Apple stated on their website and keynote, the entire catalogue on their platform will have Dolby Atmos enhanced by the end of this year. (
Source)
As of now, if you would like to experience how Ayu’s (and other artists you love) music sounds like in Dolby Atmos, all of the videos, including Lives and Music Videos on Music are actually now Dolby Atmos supported, just put on your AirPods Pro or AirPods Max and click on any videos on Music, then try to move your head around, you will hear the difference. (The difference is actually Spatial Audio, but if a video on Music supports Spatial Audio, then it supports Dolby Atmos as well.)