Cloudflare client certificate on HA iPhone/iOS App?

Pretty sure this is a dead-end (thanks Apple). But has anyone got a Cloudflare Tunnel self-signed client certificate (mTLS) working in the HA app on iPhone?

I got it working on Android HA App. And I got it working on iPhone Safari browser, but that’s as far as I’ve been able to get. It doesn’t even work in Chrome on iPhone.

Thanks.