Not Able to pass JSON string in Web-service element in instances lower than 7.18

Hi Community,

• I am trying to pass the JSON string into the Web-Service Element of the Business Process. I had tried this in one of the trial instances of version 7.18.0.1353. In this version, Web-Service Element has Request body parameter in its Advanced Setting. The screenshot of this is as below. 

• I want to implement this same POC in another instance which is in a version of  7.17.3.1377. But the "Request body" parameter in Advanced Setting of Web-Service Element and I am not able to pass JSON in this instance.

Is there any way ? to achieve this POC working in the instance of version 7.17.3.1377

Please guide me on this.

Thanks and Regards.