The X265 file includes a track. This is not the same as "Dolby Surround."
The release typically includes a dedicated bonus disc with several informative featurettes: Legacy Documentaries : Deep dives into the movie history of Captain America Black Widow Remembering Stan Lee : A featurette honoring the late Marvel creator. Production Insights Avengers.Endgame.2019.2160p.UHD.BluRay.X265.10b...