No. BIX only performs the "E" in ETL. You can only choose an output format such as CSV or XML.
That said, you could create special Data tables with the data preformatted by Pega to your liking.
If not, then either the Data Warehouse would need to convert the data extracted by BIX, the Data Warehouse performing both "T" and "L", or a something between BIX and the Data Warehouse would perform "T".