This is my dilemma all the time omg
honestly? just do it. i usually go for a mix of direct and funny. “sooo why aren’t we best friends?” or “this is ridiculous we need to hang out already” or if that feels weird just be honest, “i feel kinda weird but you give off such a great friend vibe. i’d love to hang out”
trust, i’ve done this more than a few times and it totally works. if it doesn’t work, then that person isn’t someone you wanna be friends with anyway.