No and yes.
No because the wld file is what defines the episode (name, star count, start level). One map per episode.
Yes because back in 2015 MAGLX2 has circumvented this by setting up a system in lunalua wherein in certain warps, code is executed that loads the player into a different episode entirely. MAGLX2 is like those multi-disc PlayStation games.
What I recommend is planning ahead and making use of chunking.
Ideas are useless if you can't make them real.
All my assets from packs and episodes are free to use for non-Novaverse levels and projects, as long as proper credit is given.