Reference json data from notebook output

You can convert a string to JSON using the JSON function but I don't know that you can do a lot with it at that point.

https://learn.microsoft.com/en-us/azure/data-factory/control-flow-expression-language-functions#json

Depending on your use case it may be better to write the output to a file and return the path instead so you can read the data into data factory so you can do stuff.  

If its just for purposes of logging, then the rest string should be fine.