Hi,
Yes! we can certainly get this in calculated metrics.
Calculated metrics for Variance A -
Summary:
fx (column sum ( fx ( Power operator (metric_X (Revenue) metric_Y (2))))

Calculated Metrics ScreenShot:

Note: You may need to apply a segment on top of it get Sum of Revenue for Variance A. only if using segment for Variance A Total Revenue and Variance A number of Uniques.
Thanks,
Asheesh