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On the Sony Remote box in suite H
Use the Menu and Up and Down Keys and Enter to navigate the menus

Go to User Configuration

"Suitcase" Icon

Then choose "Input Setting"

Choose HDMI Input Setting

Settings for HDR are

Color Space: DCI-P3
Transfer Matrix: ITU-R BT,2020
EOTF: 2.4

EOTF is similar to gamma but EOTF is what HDR Monitoring uses to display the # of NITS