3

You are not doing a dictionnaries but an array of object.

The correct way to do that is to use :format as text on the list of “ateliers”
This will look like Repeating group Ateliers’s list of text:format as text

Inside the format as text you will have

{
    "title": this item title:formatted as json-safe,
    "description": this item description:formatted as json-safe
}```

Delimiter ,

If you look, I didn't add ```"``` around description and title dynamic elemen because this will be added by :formatted as json-safe