Need better example for drawing legends outside of the grid

https://github.com/gonum/plot/issues/133 pointed to the heatmap example, but the legend offset code is inscrutable to a newbie like me.
I suspect that example is only useful if you actually understand gonum/plot already.

A clear example showing a simple scatterplot with one point and one label, and then the same example with the legend outside the box, would be quite helpful.

I even tried Google Gemini, but it confidently provided an example that did not work.