What you want IINA to do:
Provide a setting that allows the user to configure the target-peak option along with a way to request that IINA determine the appropriate value for this setting.

Provide a setting that allows the user to configure the mpv tone-mapping algorithm.

Display the pixel format in the inspector window.

Why you think this should be added:
These are improvements to HDR support that have already been implemented by @CarterLi. This issue is for tracking the need to merge this support.

Examples of other projects that have something similar:
These are mpv options.