Apple TV home sharing and streaming from my Mac
I've got an Apple TV device connected to the TV.
It's on the same network, with the same log-in as my iMac.
The iMac is running MacOS 12.2.
Apple TV is updated to latest version.
I have a library of ripped DVDs (the physical DVDs are stored in a cupboard) from years ago. I've copied this to a network drive and a local external drive that is attached to my Mac.
How can I stream these to the Apple TV?
I found some old documentation online (which I haven't been able to find again, perhaps it has since been deleted) suggesting I add drive I want to use to iTunes... but, of course, there is no iTunes in MacOS 12.2 and the Music app doesn't appear to have the same options.
iMac Line (2012 and Later)