Direct REST API import is planned and is not available yet.
REST API
Direct REST API import is coming soon.
Today, describe your REST API with an OpenAPI 3.x or Swagger 2.0 document, then use OpenAPI import.
If your API has no document, start with its most useful read-only endpoints. Define their paths, methods, inputs, responses, server URL, and authentication in a small OpenAPI document. You can add more operations later by importing a new version.