why should they release their doctors to a country which has lesser cases then themselves if it's not going to be more than financially beneficial to them?

I agree. There's really no reason for them to send their health workers to your country, when Nigeria is one of the countries that has the least number of cases of coronavirus. I am very suspicious of China's initiatives. Their media is censured so what they announce to global media is totally unreliable and not credible. They have hidden agenda and like you said, they want to be perceived as the next world power, replacing the United States.

I hope your government will not let its people be guinea pigs if let's say these Chinese doctors brought with them their "invented vaccinations".