SDR/HDR in webhooks metadata

I would like to see SDR/HDR playback information in webhooks payload (metadata?) in the media.play event.

I use HyperHDR for ambient lighting and need to inform HyperHDR if the HDMI signal is HDR or SDR to process the signal correctly. HyperHDR has an API that I can use, but I need to somehow find the data from Plex. Webhooks seems appropriate.