根目录下的可编码句柄动态键

所以我得到了如下所示的JSON

var json = """
{
"Array1": [
{
"FinancialYear": "17-18"

}],
"Array2": [
{
"FinancialYear": "17-18"
}]
}
"""

阵列1 和 阵列2 键看起来是动态的,它位于根,可以更像Array3、Array4等

这是我尝试过但不起作用的Struct

struct CodableJSON: Codable {
    var response:[String:[ArrayInside]]
    enum CodingKeys: String, CodingKey   {
        case response = "What should I write here ?" // What should be here ? 
    }

}