How to display percentage value in SAP design studio Chart if i have multiple filters?

Hi Experts,

We are building a Design Studio dashboard using a UNX as the backend. The version is 1.6SP2.

We have a requirement to display percentage in a chart.This chart should display data based on the dropdown value selected. I am calculating percentage value in IDT. but while doing Filtering in design studio these percentage is getting added up.

Is there any option to do custom calculation in edit initial view of design studio for unx as backend??