UPDATED: New Play Count v4.0
Set the Plays of the selected tracks to a user-entered value (they will all be set to the same value). If this value is 0 then the Last Played date of each track will be erased. (The Music app has the ability to "Reset" Plays to 0 from a track's Show Info window.)
Also see Reset Plays, Add or Subtract Play Count and New Last Played Date. iCloud Music Library users should beware of a potential bug.
More information for New Play Count and download is here.