In theory expo-secure-store could be implemented with localforage/indexeddb + WebAuthn + a fallback if biometry is not available. For our Application I have sketched out such a version for offline login.

Can you please review again if web support on expo-secure-store might be possible through this approach?

I would have attached our implementation so you may get an idea how it COULD be done. But I cannot attach it here, the upload always fails...

I also cannot attach it as code snippet because it's too long to paste here...

So I'll give you a link to a gist instead :-).