我想使用JacksonAPI(JsonFactory,JsonGenerator)生成以下结构的JSON字符串。我该怎么做？预期:{"api":{"Salutaion":"Mr","name":"X"},"additional":{"Hello","World"}}实际:{"api":"{\"Salutaion\":\"Mr\",\"name\":\"X\"}","additional":"{\"Hello\",\"World\"}"}属性api和additional的值将作为字符串提供给我。我应该使用writeObjectField(如下所示)吗？jGenerator.writeOb