Ghostrunner - PS5 HDR Settings

The peak brightness in the game seems to be fixed and not adjustable. This game does not seem to use the PS5 HDR system calibration settings. 

The main peak brightness limit is about 900-1000 nits. Exceeding the brightness of some light sources can reach several thousand nits, which will exceed the brightness limit of your TV, but this is not critical.

You can try the options of enabled and disabled TV tone mapping.

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HDR Options allow you to select HDR Profile 1, HDR Profile 2, etc. which change the gamma of the image. It is recommended to set HDR Profile 1.