Chart Dimensions label: how to display more than 1 dimension on the axis?

I have a simple 2-dimensions stacked columns chart. It is set up as below

How can I display the second dimension ? It displays only the first one !

And at the same time, any idea how to add metrics labels on the right side ? See below. I’d like to keep my monthly salary on the left and display the yearly ones on the right !

Thanks a lot.