I would like to create a multi-axis report with the html5 high-chart reports where the bar measure is associated with 1 series expression (bar's are broken out by country) and the line's measure is associated with a second series (line is the sum of the countries).
Is this possible? And if so, how would I do it?
Yes it is possible, in JasperSoft Studio 5.6 you have the Multi-Axis option in the HTML chart options using either ColumnLine or ColumnSpiline. In that chart type the last measure is always the line (you can change this in the advanced properties if you want)