如何在Swift中支持array(array，string)的变量JSON字段？

struct MyData: Codable {
    var arrayField: [Any]
    var stringField: String
}

extension MyData {
    enum CodingKeys: String, CodingKey {
        case arrayField
        case stringField
    }

    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        arrayField = try container.decode([Any].self, forKey: .arrayField)
        stringField = try container.decode(String.self, forKey: .stringField)
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode(arrayField, forKey: .arrayField)
        try container.encode(stringField, forKey: .stringField)
    }
}

let myData = MyData(arrayField: [["item1", "item2"], "string"], stringField: "example")
let encoder = JSONEncoder()
if let jsonData = try? encoder.encode(myData) {
    if let jsonString = String(data: jsonData, encoding: .utf8) {
        print(jsonString)
    }
}

{"arrayField":[["item1","item2"],"stringField"],"stringField":"example"}

let jsonString = "{\"arrayField\":[[\"item1\",\"item2\"],\"stringField\"],\"stringField\":\"example\"}"
let decoder = JSONDecoder()
if let jsonData = jsonString.data(using: .utf8) {
    if let decodedData = try? decoder.decode(MyData.self, from: jsonData) {
        print(decodedData)
    }
}