Currently, the input schema is not returned in the openapi for the create endpoint just a generic 

requestBody:
content:
application/json:
schema:
$ref: "#/components/schemas/JsonNodeModelInput"

So you need to find in the openapi for `workflowId + "_input" `to manually find the proper schema of a given workflow. The idea is to generate the proper annotations in the endpoint to include the schema reference in the requestBody.