Is it possible to add captions to avatar speech using the HeyGen Streaming SDK?

Hi, I’m currently using the HeyGen Streaming SDK (@heygen/streaming-avatar) to generate real-time avatar speech and video. I would like to display captions (subtitles) for the avatar’s spoken text.

From the documentation, I see that the video generation API supports a caption flag, but I don’t see a similar option in the Streaming SDK.

Is there a way to enable captions directly in the Streaming SDK?

If not, does HeyGen plan to add official caption support for streaming avatars in the future?

Any clarification or examples would be appreciated. Thanks!