The Workflows API collection has been released in beta. This API collection can be used to programmatically create and manage workflows in IdentityNow.
To sign up for the Workflows beta program, please fill out this Smartsheet form. You must be a customer or partner in order to participate in the beta program.
You can learn more about workflows by reading Creating and Managing Workflows - SailPoint Identity Services
Here are a couple of JSON examples to get you started.