Yes, there is. But to understand how we got to that point, it would be nice if you played Diatima Isekai. The only canonical ending in LFFG (according to the developer) is the one in which Luna favors the divine essence of
Dark Queen Raven, merges with her, and embraces her power, gaining divine superpowers.
I recommend you play LFFG at least once through this particular canon "Bad Ass Bitch" (dominant) route to fully get a feel for the atmosphere of what the Goddess Raven represents and how she solves problems.

Even within this route alone, there are several options for how things will unfold, but the best thing to do is to not cave in to anyone and act assertively and decisively.
As you know, the world of this game universe is on the brink of war between several countries/superpowers. AFAIR, 20 years after the events of LFFG end, the events of Diatima Isekai begin. I won't write about the reasons for Diatime quick ending (much has been written about it on previous pages), I'll just say that the finale of this story was the apocalypse, which did happen.
Having survived this collapse, society has degenerated to a state of medievalism over the past few centuries.
But when Luna-Raven wakes up centuries later (helped to survive by Dark Queen Raven's divine super essence), we have to start from the beginning, because our Luna essentially suffers from amnesia and remembers nothing of the events of past centuries (i.e. what happened in the canon LFFG finale).
However, at a certain point in time (you may have already seen it), Luna has a vision, shown to us as a colorful flashback in which dozens of images from LFFG's true ending, where Luna-Raven kicks everyone's ass and defeats her enemies (except the surviving Organization), flash through her mind. So, as you can see, the canon ending of LFFG has a connection to the Luna Reloaded.