These are language families. There are no "Nilo-Saharan" genes, or "Bantu" genes. Of course, the original speakers of these language families would have had relatively similar genetic profiles, but we don't know anything about those. The "African" on 23andme shows how similar you are to the reference group for Africans (Nigerians) in comparison to the "European" and "Asian" reference groups. If you're asking about admixture from the neighbouring Nilo-Saharan and Bantu populations, there's not a lot of data about that. You could try the Tishkoff study. But if I had to guess, I would say that southern Somalis probably have more Bantu ancestry than the rest of the Horn of Africa (not necessarily a considerable amount), while Ethiopians probably have more Nilo-Saharan ancestry.