如何只获得一个阴影属性，而不是基本属性，以获得JSON序列化？

class ShadowObject:
    def __init__(self, basic_property, shadow_property):
        self.__basic_property = basic_property
        self.shadow_property = shadow_property

    def get_basic_property(self):
        return self.__basic_property

    def set_basic_property(self, value):
        self.__basic_property = value

    def toJSON(self):
        return {
            'shadow_property': self.shadow_property
        }

# 示例用法
obj = ShadowObject('basic_value', 'shadow_value')
print(obj.get_basic_property())  # 输出：basic_value
print(obj.shadow_property)  # 输出：shadow_value

# 修改基本属性的值
obj.set_basic_property('new_basic_value')
print(obj.get_basic_property())  # 输出：new_basic_value

# 序列化为JSON
import json
json_str = json.dumps(obj.toJSON())
print(json_str)  # 输出：{"shadow_property": "shadow_value"}