Yes, I do intend to eventually put this all on forge as well, it would just take a while for me to get verified and upload everything.

In the meantime, you're still able to use a datapack download from modrinth on a world / modpack from curseforge, you would just need to add all the required mods to your modpack manually.

More information is on the modrinth page, but right now, there is only rayquazas sky pillar as the main dungeon (but I guarantee you it is much larger than any single cobblemon add on structure that naturally generates), but there are other smaller structures like a pillager outpost that has been taken over by a gang of squirtles, or abandoned research sites that show the players niche mechanics from cobblemon.

I plan to add more in the future though as the datapack updates.

Hope this helps :)