Hi Brice,
Thanks for your update.
The result update in the action complete event argument based on the class type of the data returned from your server (same as TItem). So, if you require to format into any other type you need to handle it in the server-side data. If you have facing any difficulties to change the format, please update here with details.
If we misunderstood your requirement. please update your requirement with detailed description. That will help us to provide exact solution as earlier as possible.
Regards,
Sureshkumar P