public static String jsonFormat(JsonNode data, Map<String, String> labels)
            throws JsonProcessingException {
        Map<String, Object> result = new LinkedHashMap<>(labels);
        Iterator<Entry<String, JsonNode>> iterator = data.fields();
        while (iterator.hasNext()) {
            Entry<String, JsonNode> kv = iterator.next();
            result.put(kv.getKey(), kv.getValue());
        }
        return MAPPER.writeValueAsString(result);
    }
Json format for 'JsonNode'

@param data The data wrapper with 'JsonNode'
@param labels The labels of dirty sink
@return The value after format
@throws JsonProcessingException The exception may be thrown when executing
inlong-sort/sort-flink/base/src/main/java/org/apache/inlong/sort/base/dirty/utils/FormatUtils.java