How to keep text formatting while displaying data from Firestore "Flutter"

I am displaying data in my application from Firebase Firestore, but when displaying texts, they do not keep the same formatting. For example, if there is a blank line between the text, it is deleted while displaying it in the application. I only want to keep the empty lines while displaying them in the application.

i use flutter.

I manually enter the data into Firestore and then display it in the application as follows:

model file:

class Post {
  final String title;
  final String image;
  final String des;

  const Post({
    required this.title,
    required this.image,
    required this.des,
  });

  Post.fromJson(Map<String, Object?> json)
      : this(
          title: json['title']! as String,
          image: json['image']! as String,
          des: json['des']! as String,
        );
  Map<String, Object?> toJson() => {
        'title': title,
        'image': image,
        'des': des,
      };
}

The second file: ( I display it here through ListView.Builder ):

 final queryPost =
      FirebaseFirestore.instance.collection('thedata').withConverter<Post>(
            fromFirestore: (snapshot, _) => Post.fromJson(snapshot.data()!),
            toFirestore: (user, _) => user.toJson(),
          );