FEM analysis and pdeplot3D - placing legend and units

Hello Matlab experts,

I'm learning the basics of FE analysis and going through the example here:

https://www.mathworks.com/help/pde/ug/pdeplot3d.html

as a final result, after the model is solved, pdeplot3D is used to show the results of the analysis. Von Mises Stress is shown with ColorMap and I'd like to add the units and the name of this variabale i.e. to add a legend to this part of the plot.

How can I do that, I couldn't find an example in the documentation of pdeplot3D.