Does ExifTool support the new HDR metadata described here?
https://source.android.com/docs/core/graphics/hdr-screenshots#android16-hdr-shot
Do you have a sample and have you tried running exiftool (use the command in FAQ #3 (https://exiftool.org/faq.html#Q3)) to see what is returned?
Based upon this previous post (https://exiftool.org/forum/index.php?topic=16733.msg89852#msg89852) and the link in the last post in that thread, at least some of the data will be in XMP, which exiftool can extract.