formula in result rows

i have a formula KF in key figure columns.

It is a ratio of count/quantity. say: KF = count/quantity

I want result rows of formula key figure (KF) to be based count in result rows and quantity in result rows.

By default result of KF is based on sum of all KFs in rows of KF column.

I want it to be only based on

ratio of result of count to result of quanity.

Please help.

Thanks