NVIDIA Vulkan Beta 525.47.07 supports extension to help VKD3D-Proton DXR
Seems like a future update of VKD3D-Proton that translates Direct3D 12 to Vulkan for Proton, for Windows games on Linux desktop and Steam Deck, will make use of a newer extension available in the new NVIDIA Vulkan Beta 525.47.07 release.