Promote deployment to Prod via Rest API

I’m using the rest API to run a pipeline that’ll deploy to Staging.

We then have a manual deploy to Prod step.

How do I run this step via the Rest API?

I’ve searched through the pipeline documentation and don’t see a way to run a particular step from an existing pipeline.

I’ve also searched through the deployment documentation and there doesn’t seem to be away to promote the environment as there is in the UI.