Man pages matching name gmail-imap-label in section 1p:

gmail-imap-label.1p.en	debian 10 / libnet-gmail-imap-label-perl
gmail-imap-label.1p.en	debian 11 / libnet-gmail-imap-label-perl
gmail-imap-label.1p.en	debian 12 / libnet-gmail-imap-label-perl