Required REST API/SOAP/FBDI to create Work Definition Name

Summary:

As part of our requirement , we need a REST API/SOAP/FBDI  to create Work Definition name when definition name not exist in system. Please provide any reference for this. 

Content (required): No

Version (include the version you are using, if applicable):

11.13.23.04.0

Code Snippet (add any code snippets that support your topic, if applicable): No