Choreo Connect 1.1.0 supports multiple topics, rate limiting, API Insights for WebSocket APIs.
Multiple topics support URL mappings which may include path params. You can enable advanced, application or subscription rate limiting based on event count or data bandwidth. API analytics can be published to the Choreo platform.

Try out in your local environment.
Tutorial Documentation: https://apim.docs.wso2.com/en/4.1.0/tutorials/streaming-api/create-and-publish-websocket-api/
Sample Chat Docker Image: wso2am/chats-sample-websocket-app:v1.0.0