Zero tax in tax base/subtotal

Hi,
I would like to ask for help with zero tax not showing on invoice in TOTAL ROW in VAT with ?Include tax base/subtotal“ turned on.

On our website we have products with 0% tax rate and they have to be added up in the total row and show tax base, even if the tax is zero, for accounting purposes.

The products are correctly set with 0% VAT rate and I’m using Modern template.

Template in customizer set like this: https://ibb.co/CPm05Cq

And the final invoice looks like this: https://ibb.co/tHQJsLM

Is there any way how to force it to show the tax base the same way how other rates are displayed? Is there any snippets for it? And if so where and how should I place it since I have no experience with coding.

Thank you all in advance!