Schedule variance in a Line Chart Widget

I'm using a variation of this formula, which allows me to sort of plot my baseline, showing roughly at level we would be complete every two weeks.

=COUNTIFS({Finish Date Column}, AND(ISDATE(@cell), @cell <= [Table Date Column]@row)) / COUNTIFS({Finish Date Column}, OR(@cell <> "", @cell = ""))

Would it be possible to add another column to my table that would list actual completion, and plot a second line in the widget to show schedule variance?

Thanks in advance!

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