One-time cc/bcc in a template?

Hello,

In a template, I’m trying to access the email addresses which users
could have put in the “one-time cc/bcc” fields when posting a reply or
comment.

I am looking for something such as:
{ $Ticket->OneTimeCcAddresses }

But I’m not really sure where I should go looking for this information.
Maybe in $Transaction ?

Thanks for any pointer !

Marc