Apache Pinot

I want to enable 'pre-aggregation' during realtime ingestion. <https://docs.pinot.apache.org/basics/components/table#pre-aggregation>
1. Can someone please point to documentation (mainly looking for schema or configs) ? 
2. Also where are the pre-aggregated data stored? (in the same table/segment or different)

Sample config: <https://docs.pinot.apache.org/configuration-reference/table#sample-configurations>

Data is aggregated and stored the same way as non-aggregated data (Pinot servers have a local copy, and push the golden copy to controller/deep-store).