I am have created a line chart. It has a unique temporal dimension which is a variable - $(vDim_Time), an expression which is also a variable - $(cv_exp_Country) - and a label for the expression, which is a variable too - $(cv_lbl_Country). And it works OK.
However, in order to optimize the space of the chart, I want to use the dual function. I have seen a simple example. Please check it below: