We would like to use a Line chart with dual Y-axis (like secondary Y axis we have in combo chart).
Any ideas if the visualization already exists which I can import and reuse?
Power KPI supports dual Y-axis now.
Thanks for your feedback.
There's no custom visual that supports dual Y-axis unfortunately.
Microsoft Power BI Custom Visuals
Dual Y Axis is going to be supported in Power KPI 1.5.0.
This version will be avaialble for end-users on 06/26/2018.
Try this https://github.com/tcd1nc/DualYAxesChart
I havent worked on it for over a year and so it needs some tweaking to make it more robust but am willing to do that if required.