How to Converts Json Request Values into HTML-encoded string.

 I am getting Bad Request in response which is due to I am passing some special Characters in json request.

To resolve this issue I need to convert all request parameters values into an HTML-encoded string.

1. Do we have options in SoapUI setting which will converts json Request Values into HTML-encoded string?

OR

2. How to do this using Groogy Script?

Please suggest me.