Pixelmon/modpack side mod question

I have a server running Pixelmon Reforged modpack in technic. Since pixelmon is such a popular mod, the mod makers added some side mods that add to the game but are not required. I was wondering if I could have one added to the mods list in my server because the mod is required on server side to work. All the particular mod does is add /commands to the server. I know for sure that the mod does not work in servers if only the client has it. I don't know if you need to add the mod to the modpack pixelmon reformed entirely, could it instead be an option or just added to the server on this account? Here's a link to the mod on the pixelmon wiki. https://pixelmonmod.com/wiki/index.php?title=Pixelmon_Extras

And here's the download for the .jar file on this page

http://mirror.pixelmonmod.com/sidemods/PixelmonExtras/2.3.6/

The first link shows more of the commands. If you know pokemon it's easy to see why this is an important mod.

Is it possible to have it added to my server? It's extremely useful, also I don't think it will stop users without the mod from joining because the other pixelmon servers have the mod but it is not default to the pack, and it still lets you use the commands in those servers. I downloaded and put the jar in the mods folder to make it work in singleplayer but the mod in multiplayer will help the entire server.

If the server is running a modpack is there a mods folder in the server files? The mod is only 130 KB and like I said, it only makes commands, which makes it basically a plugin. It's not required on client side on servers I know for sure. Every one of the sponsored servers in pixelmon has it because it is basically required for a good server. I'm not trying to run the server as a sponsored server either, it's just me and friends.

I'm not sure what you mean, but it isn't required for clients to have it on a server, and I'm also not sure why it isn't a default part of the modpack. I think because the commands are for more advanced players of pokemon and has some cheat commands. The other sidemods for pixelmon change a lot more of the gameplay than this one, I understand why those aren't default. I'll just guess this one isn't default because of some of the commands being possible cheats.