Dolby Atmos or DTS:X not showing in "Media Info" ?

[TheDreadPirate]

and that post seems to indicate that ffprobe is now able to distinguish Atmos, DTS-X etc:
https://forum.kodi.tv/showthread.php?tid=373441
hence my initial question that clearly mentionned this new ffprobe capability.

That post states that ffmpeg 6.1 has the updated tagging while Jellyfin uses 6.0.1.  You would have to install vanilla ffmpeg 6.1 instead of jellyfin-ffmpeg.  You'd have to stop jellyfin then edit /etc/jellyfin/encoding.xml and change the ffmpeg path.  Then rescan your library and replace all metadata.

Keep in mind that jellyfin-ffmpeg has a lot of drivers built in.  If you use vanilla ffmpeg you would need to install your GPU's drivers and media engine drivers.