Would like to attest the harden-runner results as evidence

[JonJagger]

Hi,
I use harden-runner (which is great) in the workflows of my open-source project to help people learn TDD in the browser with nothing to install. It's called cyber-dojo
I'd like to make an attestation, in each workflow, to Kosli, with the evidence/outcome of the harden-runner run.
In snyk, for example, I can ask for a json report (in sarif format) to be created locally.
Is there any way I could do that with harden-runner?
I specifically do not want the attestation to "point" to the Github step-summary, because that will, at some point in the future, no longer work, since GitHub drops these after a certain period of time.
Thanks
P.S. Full disclosure - I'm also head of software at a company called Kosli that is trying to help automate governance in regulated industries.