To overlay dynamic text on an image in a Google Docs template with automation

[Mesut]

I'm using an automation in AppSheet to generate PDF files with a Google Docs template.
I have a static background image (e.g., a landscape photo) that I inserted manually into the template.
What I want is to display dynamic text (coming from a column like <<[Quote]>>) on top of that image, like a text overlay.

Or to use watermark:)