How can i take off out (sorry my english) of the function the responseJSON in a array?

    func fazLogin (username: String, password: String) -> [String: Any]?? {

        let json: [String: Any] = [
            "username": "\(username)",
            "password": "\(password)"
        ]

                let jsonData = try? JSONSerialization.data(withJSONObject: json)

                // create post request
                let url = URL(string: "xxxxxxxx")! //PUT Your URL
                var request = URLRequest(url: url)
                request.httpMethod = "POST"
                request.setValue("\(String(describing: jsonData?.count))", forHTTPHeaderField: "Content-Length")
                request.setValue("application/json", forHTTPHeaderField: "Content-Type")
                // insert json data to the request
                request.httpBody = jsonData

                let task = URLSession.shared.dataTask(with: request) { data, response, error in
                    guard let data = data, error == nil else {
                        print(error?.localizedDescription ?? "No data")
                        return
                    }
                    let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
                    if let responseJSON = responseJSON as? [String: Any] {
                        print(responseJSON) //Code after Successfull POST Request
                    }
                }

                task.resume()
    }
}