I'm developing a new Gmail Add-on, which extends Compose user interface. After user do some interactions with add-on (cards) I need to add Bcc address to email, actually this is draft.
as I see from documentation I can change only body of email, add images, text etc. But how to change Bcc/Subject etc. - not clear.
Is it possible to add Bcc address if my add-on for extending compose user interface?
Thanks