Game drivers for HDR (deep color) support? Any programming examples?

Last year, NVIDIA announced that new studio drivers are now supporting HDR (deep color) depth. Does it support 12-bit depth for Dolby Vision as well? How about game driver that I had not hear any announcement yet because new games need HDR (deep color) depth that I had seen some game demo recently? Deep color depth support should not be limited because of color banding issues that I had seen.

Does new RTX 30 series support 10/12-bit deep color depth for HDMI 2.1 and DP 1.4 in both studio and game driver?

If so, does anyone have any programming demo/tutorial for HDR deep color depth in both OpenGL and DirectX? I prefer OpenGL over DirectX because OpenGL support all platforms. How about Vulkan?