Here are some links for HDR Encoding:
https://developers.google.com/media/vp9/hdr-encoding
HDR Creators Guide
Youtube media: https://www.youtube.com/watch?v=N1-Jmq7BLFE&t=208s
https://stackoverflow.com/questions/69251960/how-can-i-encode-rgb-images-into-hdr10-videos-in-ffmpeg-command-line
Report ITU-R BT.2390-11 (03/2023) - High dynamic range television for production and international programme exchange
https://www.lightillusion.com/what_is_hdr.html - good comparison of PQ vs. HLG