Feat: enhance metadata arranging. (#12745)

### What problem does this PR solve?
#11564

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/kb_app.py

@@ -18,6 +18,7 @@ import logging
 import random
 import re
 
+from common.metadata_utils import turn2jsonschema
 from quart import request
 import numpy as np
 
@@ -218,6 +219,8 @@ def detail():
                 message="Can't find this dataset!")
         kb["size"] = DocumentService.get_total_size_by_kb_id(kb_id=kb["id"],keywords="", run_status=[], types=[])
         kb["connectors"] = Connector2KbService.list_connectors(kb_id)
+        if kb["parser_config"].get("metadata"):
+            kb["parser_config"]["metadata"] = turn2jsonschema(kb["parser_config"]["metadata"])
 
         for key in ["graphrag_task_finish_at", "raptor_task_finish_at", "mindmap_task_finish_at"]:
             if finish_at := kb.get(key):