code: def time_floats_with_dt_index_lines(self):
      self.df_date_idx.to_json(self.fname, orient="records", lines=True)
  
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 3 for calling the ToJSONLines obj's underlying member method code with example usage: obj.time_floats_with_dt_index_lines() without return types