in the client, those values are stored in ajaxify.data
For your jQuery, you don't append a closing tag, it does that automatically. When you want to insert the element into the div, you need to use appendTo(). Also, unless your label has additional data, I recommend using html() instead of text().
Here's a fiddle. I also added an ID to the new label so it isn't added more than once.
Everything is possible with plugins. If I am wrong it would be nice to know why!
"few NodeBB professionals " who said this?
We have a lot of nice developers in this forum that would like to get paid for project like this. My node.js skills are still small. If i where you I would create a thread looking for a nodebb dev or star learning to code in node.js. Sometimes its just more easy to let someone make stuff for you with a small amount of $