use object of S4 class SeqExpressionSet to plot PCA with ggplot2

I have made an object of S4 class SeqExpressionSet with EDASeq which I can then analyse with plotPCA.

However the plotPCA function lacks the ability to fully adjust aesthetics. I was therefore wondering whether it is possible to change the dataset somehow so I can use it with e.g. ggplot2 or a different package that enables more adjustments.

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