Content-Type definition for SOAP Web service

I have an ETL Professional application to extract data from a MS SQL database, transform the data to json record format for an upload via a Web Service
I have the process running but currently the Web Service is showing a Content-Type of test/xml which is causing a rejection of json records that are uploaded
I cannot find a reference to which parameter controls the Content-Type to change it to application/json
I had expected it may be found as a parameter in the SOAP Action Properties but cannot see any reference

I have attached a screen shot of the current output and the parameter I am seeking to change
Has someone implement a a similar function with json data / SOAP?

Hello

Content type option was added to the latest release

Thank you for the update - will download and try the new Content Type entry
Best Wishes