I don’t think there is a native connector for that in Rasa, you can use sockets and queue handling to react to this.
a very powerful distributed queque processor is celery but this means you would have to create the handler yourself.
A queque can pool in messages and adds a delay after which the tasks(individual user messages) can be processed and thus your handler awaits the results before pushing it back to the front-end in an asynchronous way. your front end must then add the concept of polling the endpoints to retrieve the results
This could help - Custom Connectors
But adding a queque of processing messages is tricky and of course complicated but that is indeed a very native handling of messages.