there is a little hack: you can inject css with the multi-KPI object within the sheet (these injections are only valid within this sheet). you can furthermore identify each object by its own ID called tid. And so you can modify styles of each object seperately.
for more follow this guide: CSS Masterclass. Some of these functions are a little bit outdatet, since the css classes were developed further since then. But to get the key functionality out of this, it is your best starting point.
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