Ability to parse JSON within Mapper

Description

Requires a function similar to parseXML or parseEscapedXML to parse JSON data within mapper.

Use Case and Business Need

Usecase: HCM Atom Feeds responds with JSON embedded within xml element. There is no mechanism to parse the JSON within mapper and extract required information. A function that parses the json string and provide a xml node structure will be helpful in this usecase.

Original Idea Number: e9b870f4be