The "big two" have implementations. Definitely not mature but it's getting there.

https://wiki.gnome.org/Projects/Mutter/RemoteDesktop

https://docs.kde.org/trunk5/en/kdenetwork/krfb/krfb-configur...

You most likely won't see an implementation "for Wayland" because that's like asking for a websocket implementation "for HTTP" the actual compositors that speak Wayland need to implement remote desktop capabilities and then expose an API for managing remote desktop sessions (org.freedesktop.portal.RemoteDesktop) to programs that want to leverage it.

I haven't tried it, but there's also this one for wlroots-based compositors (eg. sway): https://github.com/any1/wayvnc