How can I add a CC when responding to emails in Wix Inbox?

I’m having trouble with
How can I add a CC when responding to emails in Wix Inbox?

Working in
Wix Editor, and inside the Wix Inbox on Dashboard

Site link

What I’m trying to do
I would like to add a ‘CC’ to emails when i respond to them.

What I’ve tried so far
I’ve tried pressing all the supplemental content buttons when responding to an email in the IN- BOX, but nothing appears to work.

Extra context
Anyone else have this problem?

As far as I’m aware, it’s not currently possible. Is there use case you have in mind? (e.g. copying in a supplier to a reply vs. site collaborators also having access to the inbox)