I think the princess jewelry box was harem aimed for female viewers but it was neither bl nor gl
Unfortunately "harem" for girls are written very differently than harem for men so instead of a bunch of actual romantic/sexual partners you get platonic harems and one true lover which is not a harem at all lol
But I think you could think of "How to Be the Chosen One" as harem its bl
it frustrates me to no end that there are virtually no actual harems for girls. i tried princess jewelry box before and dropped it. how to be the chosen one has a bit too much smut for my taste. the closest harem story to my taste is Men of the Harem and I've become the villainous empress of a novel, but even then it's not bl/gl and it lacks the action/power scaling i like in the male counterparts. like i want a minimum 50% plot and a maximum 50% romance, but it's so niche unfortunately.
i cant be the only one that fervently wants a bl or gl action fantasy harem?? i see all these high fantasy action manhwas, but they're harems nowadays... and i am so pissed bc there's virtually none for the female audience