// Add page numbers
  const totalPageCount = doc.internal.pages.length;
  for (let i = 1; i <= totalPageCount; i++) {
    doc.setPage(i);
    doc.setFontSize(5);
    const pageNumber = `${i}/${totalPageCount}`;
    doc.text(
      pageNumber,
      doc.internal.pageSize.getWidth() - 10,
      doc.internal.pageSize.getHeight() - 10,
    );
  }

will give you something like this at the page bottom: