如何在使用Jackson序列化ImmutableMap时保留类型信息？

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.ImmutableMap;

public class JacksonSerializationExample {
    public static void main(String[] args) throws Exception {
        ImmutableMap<String, Integer> map = ImmutableMap.of("key", 123);

        ObjectMapper objectMapper = new ObjectMapper();
        TypeReference<ImmutableMap<String, Integer>> typeReference = new TypeReference<ImmutableMap<String, Integer>>() {};

        // 序列化
        String json = objectMapper.writerFor(typeReference).writeValueAsString(map);
        System.out.println(json);

        // 反序列化
        ImmutableMap<String, Integer> deserializedMap = objectMapper.readValue(json, typeReference);
        System.out.println(deserializedMap);
    }
}