There have always been questions on how to calibrate Dolby Vision on Sony TVs. Unfortunately we are still not able to do it due to the way Dolby Vision works specifically with Sony. Sony uses a specific Dolby Vision profile, referred to "Profile 5", or "Low Latency Mode". This has also caused some compatibility issues between other TVs and sources. Here are a few things to check out if you'd like to learn more:

https://www.flatpanelshd.com/news.php?subaction=showfull&id=1554791122

https://www.youtube.com/watch?v=TA3uun0y75w

https://www.youtube.com/watch?v=Ag6K08wt6xw

https://www.avsforum.com/forum/465-high-dynamic-range-hdr-wide-color-gamut-wcg/2951666-sony-dolby-vision-tv-saga-2017-2018-a.html