LG supports WebOS 4.0, ThinQ, HDR10, 4K for all models planned in 2018, but Dolby Vision is partially supported in : all OLED TV as well as and some part of LCD TV.
OLED TV in 2018
LCD TV in 2018
Reference: https://www.flatpanelshd.com/article.php?subaction=showfull&id=1523522612