Trills and glissandos play back. If you search you will find many threads on here discussing the complexities of getting just those to play as desired. Guitar bends and jazz articulations play back, as glisses with specific speeds.
But scale-based Baroque ornaments such as turns and mordents currently require the workaround Janus described in post #3 for playback. Because they are expressive, they don’t have standard speeds and rhythms, and in many cases even the notes can differ.