copyWith method
Implementation
ColumnItem copyWith({String? label, String? value}) {
  return ColumnItem(
    label: label ?? this.label,
    value: value ?? this.value,
  );
}ColumnItem copyWith({String? label, String? value}) {
  return ColumnItem(
    label: label ?? this.label,
    value: value ?? this.value,
  );
}