Can we leverage google's document AI/Azure's AI document service to update and generate documents?

Question

Here's my goal:

1. Convert PDFdocuments into reusable templates.
2. Dynamically update these templates with text modifications using an AI model upon request [The documents are of a huge variety, we'll be dealing with images, texts, tables, invoices, etc.].
3. Generate a new PDF with the updated content.

What I've Tried So Far:

1. Used libraries like Mammoth, python-docx, pdf2htmlex, etc., but they require extensive modifications, which isn't feasible at the moment.
2. Explored tools like Adobe PDF Services, Aspose, and PSPDFKit, but they were too expensive.

I'm open to alternative solutions as long as they're cost-effective and don’t require excessive tweaking.