[QUESTION]在序列化的时候如何把 LocalDateTime 类型的null 输出为 空的字符串双引号?

LocalDateTime time=null;
序列化结果为:
{"time":null}
理想结果为:
{"time":""}
怎么能达到目的?

The issue provides only a Java snippet and expected JSON output; no repository file, test, or entry point is named. Start by reproducing the LocalDateTime null serialization example and review fastjson2's Java serialization options. Done means identifying or documenting a supported way to serialize this null value as an empty string.

Written by the indexing model from the issue text.