Honestly, if you do need lube, you're in good company. Cis women also only fully lubricate in the vaginal canal; it's possible to move some of that up to the clit, but there's no guarantees any woman would have "enough" for that sort of thing. There's usually a tiny bit of moisture around the clit, but not anything like the vagina can produce, and it's consistent/constant rather than at arousal.
With that said, yes, it's possible. I even self-lubricate enough for penetration with toys (I've also never been with a man), and as it happens, Brassard actually does use a bit of urethral mucosa around the clit to mimic a cis woman's clitoral hood. So for me it's always slightly moist there, though again, there are no guarantees about how any given body will respond. Some post-op women get very wet, and some are nearly "Sahara."