Export Values to appear as a list.

First, the text box needs to be setup as multiline.  

Next, there are a couple of ways to insert line feeds into text. 

Sinces it looks like the numbered options are separated with a comma, the esiest thing to do is replace the commas with a line feed.   I don't know how you are currently coding this, so here's just the code for doing the replacement. The "replace" function is the only important part. 

var strMultilineValue = strExportValue.replace(/\,/g,"\n");

First you need to set text field to multiline in field properties, and let's say text field is named "Text1" try something like this as custom calculation script of dropdown field:

var str = event.value;
var items = str.split(", ");
var cList = items.join("\n");
this.getField("Text1").value = cList;