How to get text from <textarea> in JMeter

In Jmeter one of my HTML Requests contains textarea in Response Body:

...
    <textarea name="responseABC" id="responseABC" rows="10">
        {
           "response" : {
              "attribute_list" : [ {
                 "type" : "string_list",
                 "name" : "FamilyName",
                 "values" : [ {
                    "value" : "John"
                 } ]
              }
          }
        }
    </textarea>
...

I need to extract the text from that textarea to send it as a parameter in a next request. I tried using

• CSS Selector Extractor (CSS Selector Expression: "textarea[id="responseABC"]")
• XPath Extractor (XPath Query: "//textarea[@id='responseABC']")

but these return the whole element.

Is there any way I can get only the text itself?