HTML Print Format - A5 Page Size

I have successfully set Custom Page size for each Print format with pdfkit-page-width and pdfkit-page-height. Example shown here is for Legal paper size.

<html>
      <head>
            <meta name="pdfkit-page-width" content="8.5in"/>
            <meta name="pdfkit-page-height" content="14in"/>
      </head>
Hello World!
</html>

Frappe Framework: v15.43.0 (version-15)
wkhtmltopdf: 0.12.6.1 (with patched qt)