Before creating a new post, I recommend going through existing forum threads and our documentation, as many use cases are already covered there and you may find a faster solution.
For your specific question about triggering facial emotions, please check this thread:
https://forum.convai.com/t/how-to-trigger-custom-facial-emotions/5366?u=k3
And the related documentation here:
https://docs.convai.com/api-docs/plugins-and-integrations/unreal-engine/blueprints-reference/convai-chatbot