Typically the OLAP data has dimensions, measures and aggregations. You can drill down the dimensions and see the corresponding measures and aggregates. You can easily change the dimensions or add additional ones and quickly introduce new measures and aggregations.

jQWidgets Pivot Grid for Angular gives you the capability to render the data in OLAP style. It is very flexible and offers excellent performance with large data sets. The Pivot Table designer component which comes with the Pivot Grid for Angular can help you quickly add new dimensions in real time.
Demos: Angular Pivot Grid
Documentation: Angular Components Docs