Configure taxonomy/extractor to extract multiple tax amounts (Invoices)

Hello! I am building an automation to read and extract the values of an invoice, using the IntelligentOCR activities and the taxonomy provided in “InvoicesReceipts Extractor - Demo” from the link: Source link.

I noticed that there is only 1 tax amount field as shown below
however, I will be processing Canadian invoices as well and some of them have multiple tax values (GST/HST and QST). I have configured the taxonomy as shown below:
How would I configure the extractor to extract the QST and GST/HST value if they are available?