Display settings for HDR in high ambient light rooms

May not be the best place for this question, but I’m an AV designer working with a Client who wants TVs in their lobby to show HDR content.

I’ve been reading the HDR standards from ITU BT and EBU they all seem to be based on HDR displays or screens setup in dark reference environments like a cinema, color grading suite, or similar.

I understand that an HDR image in a bright lobby will never look at high contrast as one in a dark room, but does anyone know any standards or best practices for this? Google is failing me, but maybe nothing exists yet.

And maybe the answer is just “unless you have a dark viewing area, only use SDR content with 2.2 gamma on the display” but I’m hoping there’s an HDR option that might be worth testing.