We do have that with owl house and amphibia, the Santa clause movies and series, and avatar, just sort of off the top of my head. None of these really have a sex harem (some of them have a single romantic interest tho), but nor did most of the anime I’ve watched, because anything involving a sex harem isn’t up my alley at all. Suuuuper cringe. But they do have the for-reasons overpowered self-insert main character in a fantasy land.
Arguably not enough to make a genre, ofc, but we do have some examples that fit better than the ones in the meme.
Edit to add - if anyone knows of more, I’m actually kinda into the genre, so I’m all eyes!