fix: update json format

visible-watermark-pita.py

@@ -99,6 +99,8 @@ class WatermarkPita(datasets.GeneratorBasedBuilder):
             with open(label_path, "r") as f:
                 bboxes = json.load(f)
 
+            print(bboxes)
+
             objects = []
             for bbox in bboxes:
                 objects.append(