如何检查SwiftUI中是否存在json数据的key？

import SwiftUI

struct ContentView: View {
    let jsonData = """
        {
            "name": "John",
            "age": 30,
            "email": "john@example.com"
        }
    """.data(using: .utf8)!
    
    var body: some View {
        VStack {
            Text("Name: \(getName() ?? "N/A")")
            Text("Age: \(getAge() ?? "N/A")")
            Text("Email: \(getEmail() ?? "N/A")")
        }
    }
    
    func getName() -> String? {
        let json = try? JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any]
        return json?["name"] as? String
    }
    
    func getAge() -> String? {
        let json = try? JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any]
        return json?["age"] as? String
    }
    
    func getEmail() -> String? {
        let json = try? JSONSerialization.jsonObject(with: jsonData, options: []) as? [String: Any]
        return json?["email"] as? String
    }
}