QR Code plugin for Typst.
Download WASM plugin from Releases and place it wherever you want.
Then from Typst:
#let typst-qrcode-wasm = plugin("path/to/typst_qrcode_wasm.wasm")
#let qrcode(arg) = image.decode(str(
typst-qrcode-wasm.generate(bytes(arg))
))
#qrcode("Lorem ipsum")