https://www.mangago.me/read-manga/camellia/
It's a cross dressing manhwa though so I'm not sure if you'll like it but the female lead actually married a girl and actually kissed her too!
About Camellia (SPOILER), I finished the novel a week ago and THEY DON'T JUST KISS!! (absolute peak GL subplot)
Anyway, I have a few lists that might interest you if you want more of a GL subplot/sis-mance(? how the hell am I supposed to call the girl version of bromance lmao):
https://www.mangago.me/home/mangalist/1765041/ (mostly GL vibes, where the FL has chemistry with female characters although she ends up with a man)
https://www.mangago.me/home/mangalist/2601042/ (either FL is a declared bisexual or there are love interests of both genders)
Basically all of these are more bisexual though, I'm sorry :/, it's usually either full blown yuri/bi romance or GL vibes BUT with straight romance

Second time asking but does anyone have any recommendations for mangas with GL subtext/friendship between two female characters so intense it almost seems romantic?? Preferably a Japanese manga, with less than 50 chapters and a story that doesn't feature a romance with a man, but beggars can't be choosers, so I'll take anything, even manhwa/manhuas.
BL subtext stories are fine too (mangas ONLY for them though) but I really want some GL subtext stories.