Add watermark or footer text to PDF

Hi everyone, is there a way to add text/watermark to a PDF? I only want to add this text at the bottom of the PDF. Any automated way/script/workflow to do this?

If I were to automate this, I’d use the features of Python as explained here:

There are probably many other ways to automate this with people’s various favorite tools.

Or manually doing it with macOS’s Preview or any of the commerical apps that work with PDFs, e.g. from Adobe, PDFPen, etc.