You may want to open a thread at Nvidia Forums and ask there since you have a RTX 2080 which is from where the video signal to your tv will be coming from.
Also, are you able to "enable" HDR Mode in Windows with your TV connected? Plus in Windows under Display, what Resolutions are showing? 4K? with HDR enabled?
Also what type of connection are you going to use to connect the TV to the GPU Card? HDMI, Display Port, DVI-D, etc.