If you need to implement the solution with the Universal Login, Passwordless is supported with the SDK. Actually, SDK doesn’t need at all a special change for passwordless as the same APIs work for Passwordless connections seamlessly. However, you will need to make changes on the dashboard for passwordless. For more details on configuring the dashboard, you may start from this page.
For the embedded passwordless login though, SDK doesn’t support it yet. You may check this Github issue which is relevant and open a feature request as @konrad.sopala mentioned.