BoxLabels

is an option for BoxWhiskerPlot that specifies labels to be given for each of the datasets.

Details and Options

To use BoxLabels, you first need to load the Statistical Plots Package using Needs["StatisticalPlots`"].
Valid settings are None, Automatic, or a list of labels. The default setting is Automatic.
With BoxLabels->Automatic, multiple boxes are labeled using Range[n], where n is the number of boxes. For a single box, no label is used.
BoxLabels->{l₁,l₂,…} specifies that successive labels l_i should be used cyclically for successive plots.

Give explicit labels for plots:

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