import 'package:flutter_survey_js/survey.dart' as s;
...
const survey = {
  "questions": [
    {
      "type": "rating",
      "name": "satisfaction",
      "title": "How satisfied are you with the Product?",
      "mininumRateDescription": "Not Satisfied",
      "maximumRateDescription": "Completely satisfied"
    }
  ]
};
...
s.SurveyWidget(
  survey: s.surveyFromJson(survey),
  onChange: (v) {
    print(v);
  },
  onSubmit: (v) {
    print(v);
  },
)

s.SurveyConfiguration(
  unsupportedBuilder: ...,
  ...
  child: s.SurveyWidget(
    survey: s.surveyFromJson(survey),
    onChange: (v) {
      print(v);
    },
    onSubmit: (v) {
      print(v);
    },
  )
)