Sharing tickets with other users when creating tickets through the portal

Sharing tickets with other users when creating tickets through the portal

Hi,
Is it possible for the user to add another user through the portal who will receive notifications about the ticket? For example, if there is a field such as cc where the end-user would select another user who would then be included in the ticket.
We want end-users to be able to add a one or few more end-users through the portal, for example a supervisor who would monitor further work on the ticket. However, I was not able to find an option for that on my own.
Is there such a possibility?

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