https://feedback.missiveapp.com/feature-requests/p/ability-to-manage-tasks-via-ai-assistant I think it could be extension of this.

Adding a comment that, yes, but also extending the API to do this. You can add a comment, but it doesn't appear like you wrote it. It appears as an API post, which is really strange, considering you can send and do everything else pretty much with the API apart from this.