Mac Color options for HP U28 4K HDR
"specific color requirements" include a profile, designed for that specific display & also the computer & GPU driving it.
It will have been supplied with a generic profile for the display type by the manufacturer, but without a hardware colorimeter to calibrate & profile that specific display, that's as accurate as you can get.
BTW, you don't really need to know what any of those numbers or characteristics mean. Consider them "rocket science" & just leave them alone.