Optional is_True, if the reaction is chosen by the current user.
Identifiers of at most 3 recent message senders, added the reaction; available in private, basic group and supergroup chats.
Number of times the reaction was added.
Type of the reaction.
Identifier of the message sender used by the current user to add the reaction; may be null if unknown or the reaction isn't chosen.
Contains information about a reaction to a message.