We have just released build 2938 which supports PARSE_JSON and PARSE_XML functions
Examples:
Object.Value = PARSE_JSON (Object.JSONAttribute, 'JSON_PATH')
where JSON_Path follows the format described here https://github.com/json-path/JsonPath#getting-started
Object.Value = PARSE_XML (Object.XMLAttribute, 'XPATH')
where XPath follows the format described here https://www.w3.org/TR/1999/REC-xpath-19991116
Also in the build - different diagrams layout generation algorithms exposed for relationship diagrams