Just sharing my recent find.
I did not want to install Plex Server on my NAS (TrueNAS) so I looked for an app that will show and play all my media from NAS via common storage protocols, like SMB ot NFS.
The Infuse does exactly this and is smart enough to merge embedded in video file metadata with external metadata (keep both settings On). Install it on Apple TV, add shared server account, and add your Movies and TVShows folders as Favourites.
Plus its free for me, all my stuff is .m4v or mp4, not free for playing .mkv. Also has MacOS/(Windows?) desktop apps with sync.
happy cake day.