Disabling FLoC on custom domain pages

I read the change regarding disabling FLoC on GitHub Pages, and how it does not affect pages that are accessed through a custom domain.

I am using Jekyll in a GitHub repo and a custom domain for my personal site, and I can confirm that the Permissions-Policy: interest-cohort=() is not appearing.

How can I add this header to my custom domain GitHub page?

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I guess nobody has any ideas on this?

+1, would love to see this resolved. I’ve opted out of FLoC on all of my web-based projects except for my one GitHub Pages site which is on a custom domain. Since it’s a CNAME record, even proxying it through Cloudflare and using Cloudflare Workers to add the header isn’t possible.