Modifying {pricing_fields} Merge Tag

We want to create an invoice for payment success GF notification, and by law in Australia, we need to include a GS Tax row of 10% like the example below:

Is there a way we can modify the pricing_field merge tag to include this GST row using GF’s actions or hooks?
I could not find anything related to modifying the pricing field tag in the Stripe Add on docs.

If not, how can we setup an email template for various forms which pulls in the form field data and modify the email template to include GST that way instead?

Hi Han. This invoice will be an email notification?

And is that total in the screenshot the same total that is sent to Stripe (i.e. with the GST included as a ‘product’)?

Can you post a screenshot of your actual notification now, with the pricing table visible?