Unfortunately the recent Roku app update of CBS AA (4.3.20200720) - while adding HDR (and 5.1 audio) tags - does not actually load HDR streams (and 5.1 is still alternate by default (either DD or DD+) accessible with the options (*) button).
The same is true for the Android/AndroidTV/FireTV app - where the app was updated to include DV and 5.1 support (with tags), but only the DV works (no 5.1 audio, because 2.0 is the default and there is no alternate 5.1 audio stream available within the app).
CBS AA app updates are being rolled out to all platforms with UI changes that include audio and video quality tags/tagging, but unfortunately its clearly premature as the underlying app infrastructure/design to support such actual streams just isn't all there yet for several platforms.
