Looking for some guidance on building expansionTile list dynamically. I have a successful Listview built dynamically from json API, but can not find any examples on buildin
I think the best way to tackle this is to use a FutureBuilder (maybe have a look at this answer). I would implement one FutureBuilder for the ExpansionTile titles and a second one for each ExpansionTile body.
The example in the above linked answer could be very well adapted to your use case. 
If you need more help, just shout and I will try to implement an example for you.