Plot a second crosstab data on secondary axis in an existing crosstab excel chart

have a column chart on top of crosstab data looking like this-

Low Medium High Critical (legend series)
North America 150 300 400 200

Europe x y z n

Asia Pacific a b c d

I am trying to plot another crosstab data (with similar headings and structure - North America, Europe, Asia Pacific, Low, Medium...) on a line chart on the secondary axis with horizontal axis points as the column chart Attached is a mock image of what I am trying to achieve. The black line graph on secondary axis