Hope this helps this code will help to access the data inside the contents from your JSON structure and map it to variables.
var jsonDecode = json.decode(jsonFile);
//Decode your json file
//then map the content details to a variable.
var content = jsonDecode['content'];
// Since data inside your json eg above is a list.
// access the first element of the list and map to a var.
var firstdata= content[0];
// then map the id and name to a variable.
String id=firstdata['id'];
String name = firstdata['name'];
use this inside the list tile inside a text widget
solved How to retrieve json data elements in to list view.builder in flutter?