Adobe api will work with existing PDF not Contain '/T' and '/DA'

I need to work Adobe api for my Salesforce org.

I already have some predefined PDF templates (PDF_TEMPLATE). Our goal is not to generate these PDF templates using the Adobe API.

Instead, we want to:

- Use the existing PDF templates.
- Populate the PDF form fields with data from Salesforce.
- Use the Adobe PDF Services API only to fill or extend the existing PDF template.

We already have PDF templates, and after filling them with Salesforce data, the output must look exactly the same as the original PDF. These are sensitive business documents, so we cannot change or redesign them.

In this case, do we need to convert the existing PDF templates to make them compatible with the Adobe PDF Services API?

If yes, could you please guide me on how to do that while keeping the PDF layout exactly the same?

Thank you!