Horizontal flipping of display with Wayland

I'm using Ubuntu 23.04 with Wayland. I use 3 extended displays, one being a small screen to be projected on a teleprompter. Is there a way to horizontally mirror/flip a display such that looking at it in a mirror it looks oriented correctly? This answer led me to the Mutter DBus configuration which indicates that this type of transformation seems possible but I can't figure out the incantation that would allow me to use it.