WebAuthN support plan on CPMB

I'd like to ask Apple about Apple's Capable Portal Mini-Browser (CPMB) WebauthN technical support and plans.

In the Captive Network Portal Standards 1.0 document 3.11 WebAuthN/CTAP2 Support (FIDO2) section, It says that the CPMB should also be able to support WebAuthN, which enables password-less, MFA.

Currently, it's confirmed that biometric authentication through WebAuthN is not supported when accessing the site on CPMB in iOS and MacOS.

Is there any technical support plan from Apple? What's the expected schedule if Apple have a plan?