This package helps to convert geographical point from a Lambert coordinate system to the WGS84 coordinate system.
import 'package:lambert/lambert.dart';
main() {
var point = Point(668832.5384,6950138.7285,0.0);
var result = point.convert(Zone.L93).degree();
print("WGS84 Lat: ${result.y} Lon:${result.x}");
}