After 0.12.0, Meridian supports a feature called "Insert After Current".
It is quite same as inserting into playlist in default Music app, but it uses PlayQ instead.
Basically, it will create a new PlayQ and shift to it automatically. The auto-created PlayQ is named "Now Playing (x)", where x is a sequential number.
However, if you add other songs into this "Now Playing" PlayQ, it will just be added into it, without creating new PlayQs.
Hope you guys will like it.