I want query brightness, Contrast in control panel by nvapi sdk,but i can not find so function,please how I should query?

I want query brightness, Contrast in nv control panel by nvapi sdk,but i can not find this function, I try GetMonitorBrightness in WIN API,can get value by SetMonitorBrightness func, but cannot get value in nv control panel,please how I should query?

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