We used essentially this technique in the SMART Health Cards specification for vaccine and lab result QRs.

https://spec.smarthealth.cards/#encoding-qrs

It's well supported by scanners but can create unwieldy values for users to copy/paste.

For more recent work with dynamic content (and the assumption that a web server is involved in the flow), we're just limiting the payload size and using ordinary byte mode (https://docs.smarthealthit.org/smart-health-links/spec)