https://nl.mathworks.com/help/matlab/ref/matlab.graphics.chartcontainer.mixin.legend.getlegend.html
matlab.graphics.chartcontainer.mixin.Legend.getLegend - Get legend object for legend mixin subclass...
This MATLAB function returns the legend for a chart object that inherits from the matlab.graphics.chartcontainer.mixin.Legend class.
get objectmatlabgraphicsmixinlegend