GitHub Pack - Access to Pull Request assignees and reviewers

Is there a way to access to the assignees and reviewers attached to a Pull Request or is this on the horizon?

My use case is tracking and actioning on Pull Requests in GitHub for a project and having access to assignees and reviewers allows me to communicate to people on my team who’s responsible for reviewing and merging the PR.

Having access to the review status of attached reviewers would also be extremely useful.