"Only the Champions League final will be shown in HD HDR. Anyone intending to watch in HD HDR will need a BT Sport subscription and the BT Sport app on mobile, tablet, Samsung Smart TVs (2015 onwards), Apple TV 4K, Chromecast Ultra or Xbox One (X and S)."
That article is about watching on 'connected devices' such as mobiles tablets, smart TVs etc. This thread began with the op enquiring if it would be available via the VM V6 box, to which the answer is yes.
_________________________________________________________ Graham I am a VM customer. There are no guarantees that my advice will work.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.
BT Sport will be streaming HD HDR for the first time via its BT Sport app on mobile, tablet, Samsung Smart TVs (2015 onwards), Apple TV 4K, Chromecast Ultra or Xbox One (X and S). There is no announcement that the app on the V6 will be upgraded for HDR in time for the Champions League final which the OP was asking about.