def write_val_axis(x_axis, y_axis, axis_ids, position = nil)
      return unless axis_ids && !axis_ids.empty?

      write_val_axis_base(
        x_axis, y_axis,
        axis_ids[0],
        axis_ids[1],
        y_axis.position || position || @val_axis_position
      )
    end
def write_val_axis(x_axis, y_axis, axis_ids, position = nil)
      return unless axis_ids && !axis_ids.empty?

      write_val_axis_base(
        x_axis, y_axis,
        axis_ids[0],
        axis_ids[1],
        y_axis.position || position || @val_axis_position
      )
    end
Write the <c:valAx> element. Usually the Y axis.