How to show Engineering units of tags in Trends using power charts
[FEATURE] PowerChart missing EngUnit display - Ignition - Inductive Automation Forum
In the graph, it’s not possible (yet).
The next best thing I could find, was adding it to the Pen Name. When creating a Pen for the Power chart through scripting, you follow the Pen's properties. You can get the EngUnit through [your]tag/Path + .EngUnit. If you read that value and put it behind your pen name like [this], you get something like this.
I hope this helped, good luck!