Using PKCE flow with @aws-sdk/client-cognito-identity-provider

Hello, I am not clear if it's possible to implement a PKCE authentication flow by using cognito SDK @aws-sdk/client-cognito-identity-provider. I am currently authenticating the user by providing a form on my application and sending username and password to my node.js backed which is using the InitiateAuthCommand with the AuthFlow "USER_PASSWORD_AUTH". I can't find the documentation to implement a PKCE flow using aws sdk? Is that even possible? And if so, what action should I implement? Thank you