Currently, the title of the passkey modal is always "Signin". It is no doubt to present such titles for signing in user experience. But, there are other use cases to leverage passkeys such as step-up authentication or confirming a transaction. Maybe, the modal title could be something like "Authentication" or others? Or, for the native api, how about adding some parameters for RPs to set such titles?
There is no way to do that today. Can you file a request through Feedback Assistant that describes the use case(s) you have in mind, then share the feedback number here? We'll happily take a look :)
I was thinking that it would be good to have this features in WebAuthn API, so I file the issue in the WebaAuthn github. Please refer this: https://github.com/w3c/webauthn/issues/1823
If you need for me to file this through Feedback assistant, please let me know. Thanks for your interest.