How to add page number option in footer with DynamicJasper API?

I am creating report with help of code:

FastReportBuilder fr = new FastReportBuilder();
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I want to add page number in footer of each page like.

page 1/3
page 2/3

---

As documented in the HOW-TO something like this:

FastReportBuilder fr = new FastReportBuilder();
fr.addAutoText(
    AutoText.AUTOTEXT_PAGE_X_SLASH_Y,
    AutoText.POSITION_FOOTER,
    AutoText.ALIGNMENT_LEFT
)