Broken support for string expression in call to openapi

If in https://github.com/kiegroup/kogito-examples/blob/stable/kogito-quarkus-examples/serverless-workflow-temperature-conversion/conversion-workflow/src/main/resources/fahrenheit-to-celsius.sw.json

we change

"arguments":  { "leftElement": "$.difference", "rightElement": "$.multiplyValue" }

by

"arguments":  "{ leftElement: .difference, rightElement: .multiplyValue }"

The body is of the request will be wrogn