I would recommend looking at the key 'charting.chart.splitSeries'. Setting that to true will cause the chart to draw each column in the data as it's own series. Along the way they also get their own y-axes.
it's not exactly what you want, cause what people generally first want is one y-axis on the left and a differet one on the right. However the splitSeries funtionality can be very useful for stuff like this and I've used it in apps in situations like this.