If you mean TrueHD and DTS-MA then it won’t happen just from the new UI. Plex plays what the client device will natively support and AppleTV doesn’t natively support those formats. If AppleTV changes to support those formats then Plex might support it.
I say might because DTS-MA 7.1 plays natively on Roku via DLNA\USB but Plex chose not to support it.
