Adding a Total line to a line chart

Hello,

I am looking to add a total line in a line chart for the selected value in the metric slicer (in visual below Team % is selected) based on what is selected in the Owner slicer, which is also the what is used as the legand in the line chart. The metric selection is using field paramaters. Is this possible? I have searched and tried a few potentional solutions but none seemed to work.

Here's what I am looking to do: