如何使用 MapStruct 将字符串转换为映射？

I have Story我的 Spring Boot 应用程序中的实体。它有String field storyInfo其中包含：

{"title":"random title", "description":"random description"}

For my Story我拥有的实体StoryDTO with map字段称为storyInfo。 问题是：我该如何转换String字段来自Strory into Map in StoryDTO using MapStruct?

尝试以下代码，灵感来自here http://javadevcorner.com/mapstruct-custom-mapping-rest-operations/

@Mapper(componentModel = "spring")
public interface StoryMapper {

      @Mappings({
        @Mapping(source = "storyInfo", target = "storyInfo", qualifiedByName = "fromJsonToMap")
      })
      StoryDTO toStoryDTO(Story story);

      @Mappings({
        @Mapping(source = "storyInfo", target = "storyInfo", qualifiedByName = "fromMapToJson")
      })
      Story toStory(StoryDTO storyDTO);

      @Named("fromJsonToMap")
      default Map<String, Object> fromJsonToMap(String storyInfo) throws IOException {
        if (Objects.nonNull(storyInfo)) {
            ObjectMapper objectMapper = new ObjectMapper();
            Map<String, Double> result = objectMapper.readValue(storyInfo, new TypeReference<Map<String, Object>>() {});
            return result;
        }
        return null;
      }

      @Named("fromMapToJson")
      default String fromMapToJson(Map<String, Object> storyInfo) throws JsonProcessingException {
        if (Objects.nonNull(storyInfo)) {
            ObjectMapper objectMapper = new ObjectMapper();
            String result = objectMapper.writeValueAsString(storyInfo);
            return result;
        }
        return null;
      }

}