There looks to be some movement on this - see the comments in https://github.com/Yubico/libfido2/issues/464#issuecomment-1577748167
The long and short of it; is that it looks like SSH now supports this, but you have to provide your own SSH_SK_PROVIDER by compiling libfido2 as detailed in the comments and this gist https://gist.github.com/thelastlin/c45b96cf460919e39ab5807b6d20ac2a - I haven't verified this myself yet...
bobshand
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