Workflow variables when Trigerred via REST API

I am attempting to trigger a workflow using the REST API endpoint /automation/workflows/{workflowID}/exec .
The workflow does get triggered; however, it is not clear from the documentation how to send variables for the workflow’s initial scope (record , namespace , etc.).
Could anyone refer me to more information on this?

I’d suggest you use the debug step right after the trigger to see the state of the workflow. Id you wish I can look into preparing a little cheat sheet regarding state variables but I can’t guarantee when I can get around to that.