Since the Wayland Protocols 1.41 release with color management / HDR being added, there's been a lot of activity in different open-source project upstreams. Compositors have been adding support , various apps are adding support , and now the Vulkan WSI code within Mesa has support for it.
The now-merged work for Mesa 25.1 plumbs in the Wayland color management protocol to the Vulkan windowing system integration. In turn this allows Mesa Vulkan drivers to support more color-spaces via VK_EXT_swapchain_colorspace and the VK_EXT_hdr_metadata Vulkan extension for dealing with HDR meta-data on Wayland. This Mesa code depends upon the Wayland compositor being used to support this protocol.
The Mesa code was written a few months ago by KDE developer Xaver Hugl but had been held up waiting on the actual Wayland Protocols release. See the merge request for those interested in all the details on this color management / HDR support on Wayland with the Mesa Vulkan drivers.