Kinda, I think. I have no real Experience with Realms. But:
Problem is, afaik you cant use Mods or Plugins on Realms.
if you can access your SaveGame on the Realms Server. You can Replace you Current world, with a Pregenerated TC world.
That means, you would use a Spigot Server (Local) or Singleplayer Mod to create your world. Pregenerate it to your Liking. And then Replace the Save of your Realms Map with the Pregenerated.
But this works only if you have Access to the world of your Realms server.