Current HDR support starts at 9th Gen (Gemini) and based on Q&A with Intel devs a couple of days ago Intel has no current plans to implement HDR for older Generations. We might try to influence that once Kodi support has matured, but I wouldn't get hopes up.
NUC7PJYH is not official supported by Intel with HDR but it still work with smp build for me to get HDR.