Unfortunately this is a premium plugin, so it is a bit difficult for us to add to the panel. However, there are quite a few head plugins available already for free that you can find by searching, like HeadsPlus, Custom Heads, and MoreMobHeads.
Minehut Unleashed will be unveiling the ability to upload your own plugins, so if you do own this plugin and wish to add it to your server, you will be able to do so when that is released!