If you select multiple messages in the list view and mark them as spam, Gmail will ask if you want to also unsubscribe. Probably using this mechanism? Repo

If you select multiple messages in the list view and mark them as spam, Gmail will ask if you want to also unsubscribe. Probably using this mechanism? Report Spam and Unsubscribe These messages will be marked as spam. Would you also like to stop receiving similar messages from following senders? Learn more. <list of sender names> [Report Spam & Unsubscribe] [Report Spam]