code: def add_net_values_to_bar_plot(axs, color='k'):
      
      axs = axs if isinstance(axs, Iterable) else [axs]
      for ax in axs:
          box_args = _get_boxes(ax)
          for x, args in box_args.items():
              rect = mpatches.Rectangle(*args, color=color)
              ax.add_patch(rect)
docs: Add net values next to an existing vertical stacked bar chart
  
      Parameters
      ----------
      axs : matplotlib.Axes or list thereof
      color : str, optional, default: black
          the color of the bars to add