This link has Netflix's HDR FAQ. Note that HDR is only delivered to PCs via Microsoft Edge and the Windows 10 app, and THEN you need to meet the requirements that they specify. As for this "Cinema HDR", I'm curious what that means too. Dell's first "HDR" display supported what they called "Dell HDR" and they specifically noted that it did not conform to HDR10 or any other HDR standard accepted ...
Windows 10 supports HDR. If you have the hardware to support it, you can enable it from the Settings app. The option is a bit buried though so it wouldn't come as a surprise if the common user doesn't know it even exists. If you do have the hardware to watch HDR content, you might want a quicker way to enable it.