code: def from_dflist_to_multiindex(obj, store=None):
      n = len(obj)
  
      mi = pd.concat(
          obj, axis=0, keys=range(n), names=["instances", "timepoints"]
      )
  
      if isinstance(store, dict) and "index_names" in store.keys():
          mi.index.names = store["index_names"]
  
      return mi
  
imports: import numpy
  import pandas
  from sktime.datatypes._convert_utils._coerce import _coerce_df_dtypes
  from sktime.datatypes._convert_utils._convert import _extend_conversions
  from sktime.datatypes._panel._registry import MTYPE_LIST_PANEL
  from sktime.utils.pandas import df_map
  from sktime.utils.validation._dependencies import _check_soft_dependencies
label_desc: Use image node_id 40 for calling a global function with example usage: from_dflist_to_multiindex(obj, store) and returns: mi