Flutter – Assign Future<String> to String variable inside FutureBuilder

I have this Stateless Widge and I am trying to dynamically get the driving distance from the users location to a predefined location and want to display the distance as a string. I have a Future request within a FutureBuilder. When I assign it to final this way I get Instance of Future. I have scoured the internet and yet to have found any thing with nested Future within a FutureBuilder. Is there a way to do this? Do I need to generate another async/await method to call and assign this future string?

I commented in the FutureBuilder where I want to assign the string value and the Future method call is below the FutureBuilder

Thanks in advance

class LocationInput extends StatelessWidget {
  final getLoc;
  LocationInput({Key? key, required this.getLoc}) : super(key: key);
  PolylinePoints polylinePoints = PolylinePoints();

  double _distInMeters = 0.0;

  @override
  Widget build(BuildContext context) {
    var userLocation = determinePosition();
    return FutureBuilder(
      future: userLocation,
      builder: ((BuildContext context, AsyncSnapshot<Position> snapshot) {
        if (snapshot.hasData) {
          final distance = getDistance(getLoc, snapshot); // THIS IS WHERE I WANT TO ASSIGN THE FUTURE<STRING> AS A STRING
          return Padding(
            padding: const EdgeInsets.only(right: 8.0, top: 12.0),
            child: GestureDetector(
              onTap: () {
                getDirections(getLoc.latitude, getLoc.longitude);
              },
              child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[Icon(Icons.directions)],
                  ),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: <Widget>[
                      Text("$distance mi"),
                    ],
                  )
                ],
              ),
            ),
          );
        } else if (snapshot.hasError) {
          return Center(
            child: Text("An error has occurred please try again."),
          );
        } else {
          return Center(
            child: Padding(
              padding: const EdgeInsets.only(right: 8.0),
              child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: <Widget>[
                      IconButton(
                          onPressed: () {}, icon: const Icon(Icons.directions))
                    ],
                  ),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: const <Widget>[
                      Text(""),
                    ],
                  )
                ],
              ),
            ),
          );
        }
      }),
    );
  }
}

Future<String> getLocDistance(getLoc, snapshot) async {
  List<LatLng> polylineCoordinates = [];
  PolylinePoints polylinePoints = PolylinePoints();
  PolylineResult result = await polylinePoints.getRouteBetweenCoordinates(
    googleMapsApi,
    PointLatLng(getLoc.latitude, getLoc.longitude),
    PointLatLng(snapshot.data!.latitude, snapshot.data!.longitude),
    travelMode: TravelMode.driving,
  );

  if (result.points.isNotEmpty) {
    result.points.forEach((PointLatLng point) {
      polylineCoordinates.add(LatLng(point.latitude, point.longitude));
    });
  } else {
    print(result.errorMessage);
  }

  //polulineCoordinates is the List of longitute and latidtude.
  double totalDistance = 0;
  for (var i = 0; i < polylineCoordinates.length - 1; i++) {
    totalDistance += calculateDistance(
        polylineCoordinates[i].latitude,
        polylineCoordinates[i].longitude,
        polylineCoordinates[i + 1].latitude,
        polylineCoordinates[i + 1].longitude);
  }
  return ((totalDistance * 1000) / 1609.344).toStringAsFixed(2);
}