All my Various Artists albums show the album artist as John Williams in Plex

That’s what I use as well.

No, don’t do that.
Compilations are just like regular albums. The only difference is the name of their AlbumArtist, which is “Various Artists”.
Organize them as shown above.

First verify to which folder your music library has been pointed. That will serve as the root folder of your music.
In there, you have subfolders for each AlbumArtist.
Each AlbumArtist folder will in turn contain a subfolder for each album.

This is an example for a typical compilation album.
You can see the meta tags as well as the folder structure and file names:

After extensive attempts to get a good match and various failures it is sometimes helpful to perform the Plex Dance “light” (i.e. without step 4).

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