Option to rename trend line in chart
There doesn't seem to be an option to rename trend lines.
Because it's usually nicer to have the legend in list form on the left or right, this means almost half the chart space in a dashboard report is used up by the legend, since it displays:
Trend using Polynomial Regression (<field_name>)
which takes up a lot of space. I'd like to be able to rename it to just 'P(3) trend' for example.