Hello,
Thanks for the feedback!
Your question seems more related to general ACF development. Unfortunately I can only provide support for the ACF Extended plugin here.
I would recommend to contact the ACF Support here for questions regarding its integration, like in a widget in your case.
Additionally, you could try to create a topic on the ACF Community Forum. It’s great place for this kind of request, as the there’s a lot of developers who are willing to help users with custom development in there.
Hope it helps!
Have a nice day!
Regards.