code: def add_plot_series_command(subparsers):
      desc = """Plot *.series.txt files produced by nnabla.MonitorSeries class.
  
  Example:
  
      nnabla_cli plot_series -x "Epochs" -y "Squared error loss" -T 10 -l "config A" -l "config B" result_a/Training-loss.series.txt result_b/Training-loss.series.txt"""
  
      add_plot_any_command(
          subparsers,
          "plot_series",
          "Plot *.series.txt files.",
          desc,
          plot_series_command,
      )
  
label_desc: Use image node_id 5 for calling a global function with example usage: add_plot_series_command(subparsers) without return types