docstr: Fix for extra initially being exported as a string.
docstr_tok: ["Fix","for","extra","initially","being","exported","as","a","string","."]
code: def fix_extra(
      self, data: dict[str, Any], **kwargs: Any
  ) -> dict[str, Any]:
      """
      Fix for extra initially being exported as a string.
      """
      if isinstance(data.get("extra"), str):
          data["extra"] = json.loads(data["extra"])
  
      return data
  
imports: import json
  import re
  from typing import Any
  from flask_babel import lazy_gettext
  from marshmallow import fields, pre_load, Schema, ValidationError
  from marshmallow.validate import Length
  from marshmallow_sqlalchemy import SQLAlchemyAutoSchema
  from superset.datasets.models import Dataset
  from superset.exceptions import SupersetMarshmallowValidationError
label_desc: Use image node_id 1 for calling the ImportV1ColumnSchema obj's underlying member method code with example usage: obj.fix_extra(data) and returns: data