How to use Sales Account custom fields in the Contract Terms RTF template?

Summary:

How to use Sales Account custom fields in the Contract Terms RTF template?

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Hi,

I'm creating my own Contract Terms RTF template, based on the standard one, but I need to add a custom field from Sales Account in my template.

How can I get it?

I have a custom field, called CNPJ_c. I know I can get it using a variable and adding to a clause, but I don't want to add the field in a clause, it has to be fixed on the template.

For example, to get the customer name (Primary Part name), I would use <?ExternalCustomerPartyPVORow/PartyName?>, how could I have my field CNPJ_c available in the RTF?