For one, Harper's Bi. Then there's the reality that she's pretty much in limbo, and even when she wasn't, romance and love weren't part of the stories she was. Her brother's sexuality was more relevant then hers was. Batwoman is a lesbian, but in addition to how she comes in and out of prominence, she doesn't have any present, consistent love interests of her own (outside the occasional flashbacks to random story-relevant flames from times gone by, outside of whom her sexuality may as well not even factor).
That shouldn't constitute as "enough", especially given the context and circumstance of those two characters. Notably, the Bat-verse has no prominent male LGBT+ representation. While I'm not sure they'would consider going in this direction, all things considered, eventually developing Damian as bi or poly would be an interesting direction to take.
And anyway, it's not the big thing to give him a love interest and a serious romance plot, honestly. That idea, the notion that teens no matter how young must have some romance subplot (or just the habit of writers to obligatorily insert such plots in any old story in general) is why obligatory romance plots tend to litter works, regardless of quality.