Apple Music: How to Purchase A Song After Streaming in Apple Music

There was an old thread, and no progress on this!

How can we easily buy the song in Itunes Store, if that is already added as an Apple Music file?

Very inconvinient, that in Itunes Store it's "Play" instead of "Purchase". Still no fix!

I am an Apple Music subscriber. I found a song I like. I "checked" it, now streaming it, and added it to a playlist I created. How would I then PURCHASE that song? From my Macbook and from my iPhone as well, I cannot figure out how to do this. When I "go to the song in iTunes", it very cleverly displays "play song" but does not allow a purchase. I can "gift the song", share it, etc., but no option to actually PURCHASE the song.