def add_page_num(page, text: str, options):
# Get page num information
width, height = (inch * options["page-size"]["width"], inch * options["page-size"]["height"])
font, size = (options["page-num-font"]["name"], options["page-num-font"]["size"])
packet = io.BytesIO()
# Draw text on canvas
page_num = canvas.Canvas(packet, pagesize=(width, height))
page_num.setFont(font, size)
page_num.drawCentredString(1.5 * inch, height - (.02 * size * inch), text)
page_num.save()
# Add page number to existing page
packet.seek(0)
page_num_pdf = PdfFileReader(packet).getPage(0)
page_num_pdf.mergePage(page)
return page_num_pdf
