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 workflows.zip” from the link: Source link.

I noticed that there is only 1 tax amount field as shown below
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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:
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How would I configure the extractor to extract the QST and GST/HST value if they are available?