You sure you aren't thinking of Amazon?
Netflix you just select the show and it plays in the best version available. They have many shows that support 4k, HDR and Dolby Vision.
At least that is my experience of the LG B6 TV app.
I don't recall ever being that impressed with something that i thought wow this 4k is awesome.It looked just like HD. (I have 100MB connection and a 4k sub!!!)