The recommended way to do this is to use a citation style designed for footnotes, as this is natively supported by Typst:
#set page(height: auto)
#set cite(style: "chicago-notes")
This is a citation@typst
#bibliography("bib.yaml")
bib.yaml file for reference
typst:
type: Web
title: Typst
author:
- Laurenz
- Martin
url: https://typst.app