Not yet, but its something I'm looking into. The problem with mirrors is that it can be a bit difficult to get right as would require some work on the user side to get right.
This is because the mirror needs to be able to be ordered behind the player. And the reflection also needs to be a flipped direction version of the player, and ordered below too.
This is trivial if you design mirrors to be rendered always below a character, but you can't for example have a mirror be both allowed in front and behind the player. (I mean you could also do that but it'd require toggling on/off z depth values)