Niche careers that don’t have many needed professionals, but also don’t have many applicants?

I worded this poorly i think lol, but, like, a career that requires very specific knowledge that means there aren’t a lot of people who come into that knowledge or seek it out, but also there isn’t that much demand that people are more likely to actually look to get into it.

I was just thinking about it cause i saw a post on CScareerguidance talking about IT Law and how someone needed both a law degree and a comp sci degree to get into it. Those are both not uncommon degrees so im not sure that qualifies, but i guess that sorta thing?

Not for any reason other than interest i guess, unless someone can think of a particularly good one that aligns with my disparate interests lol