It’s a real role that’s hired in the Jewish community. Both to encourage in-faith marriages and to foster a sense of community. Usually one person for teens, another for young adults, and others for men’s club, woman’s club, newly parents, retirees...etc

It’s generally funded by synagogues and charity foundations.

I’d of thought the Christian churches/denominations have similar programs.

It could be unique to Jews due to historical and present anti-Semitism. E.g. Jews were (and still are in a few establishments) barred from many fraternities, country clubs, athletic clubs, summer camps...etc