Add trendline/Target Line to column chart

[HenrikT]

Hi,

I'am trying to modify a regular rave column chart with a trendline/target line unsuccessfully. I want to be able to modify the target line from within report studio, i.e. not hard coding the vaule itself in the Json code. What I have done so far is that I have modified a combination chart so that the lines and columns share the same axis. But in the graph the line starts in the middle of the first column(s) and ends in the middle of the last column(s), that is 50%. This I can modify so that it starts at 0% but then the line ends at 0% of the last column.

Has anyone any tips on how to add a trendline/target line in a column chart or to force the line in a combination chart to start at the begining of the first column and en at the ending of the last column?

Thanks
Henrik