code: def update_label_for_freq_and_agg(val):
      """
      Formats sub-values contained within 'val' to display date frequencies & aggregatioms if included.
          - (val=['a', 'b', 'c']) => 'a, b, c'
          - (val=['a||H', 'b||mean', 'c']) => 'a (Hour), Mean of b, c'
      """
  
      def _freq_handler(sub_val):
          selected_agg = None
          for agg in AGGS:
              if sub_val.endswith(
                  "{}{}".format(CHART_JOINER_CHAR, agg)
              ):
                  selected_agg = "{} of".format(text(AGGS[agg]))
                  sub_val = sub_val.split(
                      "{}{}".format(CHART_JOINER_CHAR, agg)
                  )[0]
                  break
  
          selected_freq = None
          for freq in FREQS:
              if sub_val.endswith(
                  "{}{}".format(CHART_JOINER_CHAR, freq)
              ):
                  col, freq = sub_val.split(CHART_JOINER_CHAR)
                  if freq in FREQS:
                      sub_val = sub_val.split(
                          "{}{}".format(CHART_JOINER_CHAR, freq)
                      )[0]
                      if freq in FREQ_LABELS:
                          selected_freq = "({})".format(
                              text(FREQ_LABELS[freq])
                          )
                      break
  
          return " ".join(
              list(filter(None, [selected_agg, sub_val, selected_freq]))
          )
  
      return ", ".join(
          [_freq_handler(sub_val) for sub_val in make_list(val)]
      )
  
imports: import json
  import dash_bootstrap_components
  import dash_colorscales
  import dash_daq
  import os
  import plotly
  from pkg_resources import parse_version
  from six import PY3
  from dtale.dash_application import dcc, html
  import dtale.dash_application.custom_geojson
  import dtale.dash_application.extended_aggregations
  import dtale.global_state
  from dtale.charts.utils import AGGS, ANIMATION_CHARTS, ANIMATE_BY_CHARTS, YAXIS_CHARTS, ZAXIS_CHARTS, NON_EXT_AGGREGATION, build_final_cols, find_group_vals
  from dtale.column_builders import get_cleaner_configs
  from dtale.constants import CHART_JOINER_CHAR
  from dtale.dash_application.layout.utils import build_input, build_option, build_tab, build_cols, build_hoverable, build_selections, show_style, FREQS, FREQ_LABELS
  from dtale.translations import text
  from dtale.query import build_query, handle_predefined, inner_build_query, run_query
  from dtale.utils import ChartBuildingError, classify_type, coord_type, get_dtypes, is_app_root_defined, make_list
label_desc: Use image node_id 18 for calling a global function with example usage: update_label_for_freq_and_agg(val) and returns: str, str