Genesys Chat: Injecting canned responses via Conversations API

We are automating chat agent actions via Terraform-driven workflows and need to push a canned response to an active chat conversation. The documentation for POST /api/v2/conversations/chat/interactions is sparse regarding the text payload structure for canned responses. When I attempt to send the standard text message, the agent sees it as a manual reply, not the formatted canned snippet. Is there a specific type or metadata flag required in the JSON body to trigger the canned response rendering? Here is the current payload failing to apply the formatting correctly.