This will be useful.
You can see a video example of this in action between the Foundation Devices hardware wallet & Blue Wallet in this video, at the 17m48s mark:
The easiest to do is output these UR QRs from your site, as there are multiple libraries in multiple languages to support them, but I also know that there are some major web-based transaction coordinator services also planning to add Browser scanning of PSBTs on laptops with cameras as well.
— Christopher Allen