I was just wondering if more mob heads plugin (from vanilla tweaks) could be added to the datapack list on the servers. Here is a link for the plugin just in case. I've seen this been requested quite a bit on the minecraft forums and was hoping that providing a file would help. P.S. If this doesn't work, try this link: https://vanillatweaks.net/picker/datapacks/#
~Thanks PixelMochii