code: def peakmem_time(self, frames):
      df = frames["datetime"]
      for _ in range(10_000):
          df.to_json(orient="table")
  
imports: import sys
  import numpy
  from pandas import DataFrame, Index, concat, date_range, json_normalize, read_json, timedelta_range
  from ..pandas_vb_common import BaseIO
  from ..pandas_vb_common import setup
label_desc: Use image node_id 4 for calling the ToJSONMem obj's underlying member method code with example usage: obj.peakmem_time(frames) without return types