Different album covers for discs in a boxset

Time to revive this relatively young (!) future request!

Please add support for a main cover for the boxset (as now), and individual covers for each album within the set shown in “now playing”. Something like the following:

boxset / cover.jpg
       / disk_1 / cover.jpg
                / 1-01 track 1
                / 1-02 track 2
                :
       / disk_2 / cover.jpg
                / 2-01 track 1
                / 2-02 track 2
                :
       / disk_3 / cover.jpg
                / 3-01 track 1
                / 3-02 track 2
                :
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