That would be dope. Just like Azteco vouchers.
Unfortunately I don't know how you'd make it work.
I founds some articles though:
https://docs.lnbits.org/guide/faq.html#troubleshooting - search lnurlw, there's a section called Vouchers
https://medium.com/@buddylasta/how-to-giveaway-bitcoin-on-the-lightning-network-4443e03f234f