The new Firmware 7.0 of PlayStation 4 and PS4 PRO (now in Beta only for a small number of users) not only presents news related to Party Chat but also to HDR, as reported by the first testers.
The Talgold Redditor states that he has discovered in the firmware a new HDR option, which allows to increase or decrease the brightness level in a similar way to what happens with other image parameters such as contrast and sharpness.
Generally, the games do not offer specific options for HDR whereas with the new firmware it will be possible to make adjustments directly from the video options menu of the operating system. Note how this feature will also be compatible with apps, including Netflix and Amazon Prime Video.
At the moment we don’t know when the new firmware will be available for everyone.