Pivot Table option to have total and subtotal calculation without group by

What is the problem or goal the end user is trying to solve or accomplish?

User may have a use case where the total calculation is calculated by SUM(metricA)/SUM(metricB). Right now, the total calculation is taking the sum of column/row.

How are they solving it currently?

Not possible at the moment

What is the recommended solution by the Customer?

Toggle to change the level of aggregation at the total or subtotal calculation