toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'boosted_chat_id': boostedChatId,
'additional_chat_ids': additionalChatIds.map((item) => item).toList(),
'winners_selection_date': winnersSelectionDate,
'only_new_members': onlyNewMembers,
'has_public_winners': hasPublicWinners,
'country_codes': countryCodes.map((item) => item).toList(),
'prize_description': prizeDescription,
'@type': constructor,
};