Access JSON payload properties in Assign Message policy

[zubermohammad]

I found that we can do request.header.{header_name}.value to get header values.

Instead of doing a extract variable for each property and then use Assign Message.

Is there any way we can use directly the properties of JSON payload in Assign Message?

It would be a good enhancement to access payload using JSONPath or XPath in policies if its not available already.