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Pass in outlier points to precomputed box plot

Creating box plots derived from millions of points requires pre-calculating quartile stats as outlined here:

works great, and in a simple case with one box per axis point it’s easy to overlay a scatter trace with outlier points if desired. In a grouped case with multiple boxes per axis point I have found no way to align a scatter trace to each box trace. Is there a way to pass outlier points to a Box trace directly so it can self align or somehow offset scatter trace positions to box trace offsets?