Extract text from complex List column

[iBusinessBI]

I am pulling data from API.
One of my columns is a complex column (CDR_LIST) that has List of Records that contain other Lists, etc....

I don't want to Expand/Parse this column now, but, instead, I would like to add a TEXT column that extracts all the information from the CDR_LIST column as a text, so I can use it later (I am working with Dataflow). The text can be a JSON or other text but I want the new column Data Type to be TEXT (ABC), not list.
Please help 

[lbendlin]

One would assume that the API produces JSON output.  You can treat that as text.

[iBusinessBI]

HOW can I (dataflow) treat is a a text?

That's exactly my question.

Look at the screenshot - last column. It is shown as a List, not ABC-Text.

How can I save it as Text?

[lbendlin]

You would do that before you interpret the API response as JSON.

[iBusinessBI]

I use a regular Web.Contents connector which returns Binary. 
That is my question - HOW do I convert it as Text column?

[lbendlin · Accepted solution]