WXO/CPD Teams Channel: Pre-response acknowledgement or typing indicator support (IBMAII-502)

We are using watsonx Orchestrate / CPD with Microsoft Teams through the IBM-provided Teams channel endpoint. Our Azure Bot registration points directly to the WXO/CPD messaging endpoint:

/orchestrate/.../channels/teams/.../events

We would like to improve the Teams user experience for agent responses that take a few seconds because of RAG retrieval and collaborator calls.

Can you confirm whether WXO/CPD Teams channel supports any built-in option to send an immediate pre-response acknowledgement or typing indicator before the agent finishes processing?

Desired behavior:

User sends message in MS Teams
-> Teams immediately shows either:
   - typing indicator, or
   - separate message: "I'm working on it."
-> WXO agent continues retrieval/tool/collaborator work
-> Final answer is sent as a separate response

Questions:

1. Is there a supported Teams channel setting for automatic typing indicators during long-running agent processing?
2. Is there a supported configuration for a separate acknowledgement message before the final answer?
3. Can this be configured per channel, per agent, or globally?
4. Can an agent_pre_invoke plugin send an outbound Teams activity, or are plugins limited to payload inspection/modification?
5. If this is not currently supported, what is IBM’s recommended pattern?
   • Built-in channel setting?
   • Custom Teams bot proxy?
   • Middleware in front of the WXO channel endpoint?
   • Product enhancement request?

Current workaround explored:

We created a WXO pre-invoke plugin that can call an external webhook, but it cannot directly send a Teams message into the active IBM Teams bot conversation because the outbound Teams channel credentials/session are owned by the IBM WXO/CPD channel endpoint.

Please advise on the supported approach for sending an immediate acknowledgement or typing indicator in the IBM-managed Teams channel.