The thing here is that League doesn't have a parallel to "Africa." Much like how the closest thing to, say, medieval Europe is Demacia, and the closest thing to Asia is Ionia, the closest thing to Africa that we've seen is either Shurima or Illaoi's isles, depending on what part of Africa we're referring to.
Illaoi definitely fits much of what you ask, as her island home seems inspired by both African and Samoan cultures. Other than that you'd have to effectively create a new tribe or culture in Runeterra -- that's not a PROBLEM, by any means, but I'd like to see it serve a stronger story purpose than "get a reference to a specific real-world culture." Maybe somewhere in Kumungu or the Fyrone Flats? We don't know much about either place, to my knowledge.