Download visual data grouped as in the visual

I have client request, where they want to download data displayed in a visual, but they want to download it in a way how it is displayed in the 'show as table ', not the way it is in the original SQL source table. The original table has 3 important columns: datetime, variable_name, value. I want to display line chart value by datetime, where I have the variable_name in the legend. If I show it as table, I get the following. 

Is there a way to download the data in the way showed in that table? Because if I download the underlying data, I get again  only the columns and rows that are in the original source table.