This is a fantastic article and it includes a link to an app that you MUST download and install on your Firestick to unlock the real magic! I have been wondering about this very thing ever since I got my six 4K Firesticks a while back.
This will allow you to actually verify you are seeing HDR 10 and Dolby Vision. Afterall that's why we invest in our high dollar TVs and Home Theaters.
https://www.aftvnews.com/how-to-ensu...-vision-video/