Dynamic trend line based on measure option not available in bar chart

Hi,

I have created stacked bar chart with actual as measure and subgroup as category.In that I want to display target measure as a trend line.I don't see any option as dynamic trend line. 
I am able to give some static value as target in constant line(Analytic feature) but not dynamic measure value.Please provide solution. 
Currently I am using August released Power Bi version.

Thanks in Advance