如果retrofit2有嵌套数组，如何创建用于post的数据字段

public class NestedArrayModel {
    private List<List<String>> nestedArray;

    public NestedArrayModel(List<List<String>> nestedArray) {
        this.nestedArray = nestedArray;
    }

    public List<List<String>> getNestedArray() {
        return nestedArray;
    }

    public void setNestedArray(List<List<String>> nestedArray) {
        this.nestedArray = nestedArray;
    }
}

public interface ApiService {
    @POST("your_endpoint")
    Call<ResponseBody> postData(@Body NestedArrayModel nestedArrayModel);
}

List<List<String>> nestedArray = new ArrayList<>();
List<String> innerArray1 = new ArrayList<>();
innerArray1.add("value1");
innerArray1.add("value2");
List<String> innerArray2 = new ArrayList<>();
innerArray2.add("value3");
innerArray2.add("value4");
nestedArray.add(innerArray1);
nestedArray.add(innerArray2);

NestedArrayModel nestedArrayModel = new NestedArrayModel(nestedArray);

ApiService apiService = retrofit.create(ApiService.class);
Call<ResponseBody> call = apiService.postData(nestedArrayModel);