In the UI, when you create a Databricks App, you can select an existing chat template (see below), which will ask you for your model serving endpoint. In this context, you would provide the Multi Agent Supervisor's endpoint, which will be configured for the Chat App.
You can use this for reference to build a chat app. There are several templates to get started: https://docs.databricks.com/aws/en/generative-ai/agent-framework/chat-app
I hope this helps.
