toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'video': video?.toJson(),
'added_sticker_file_ids': addedStickerFileIds.map((item) => item).toList(),
'duration': duration,
'cover_frame_timestamp': coverFrameTimestamp,
'is_animation': isAnimation,
'@type': constructor,
};