@Pstork1
Thanks for your reply.
I know what you have mentioned about in your previous reply and I do followed them.
Sorry that may be I haven't put the question clear enough.
Let me try to illustrate it again.
Previously I used the "Mail" Connector, sending out emails to (for example) "receipent1@g.com" and then CC "123abc@teams.com", whereas "123abc@teams.com" is the email address of a teams channel. As from the figure in the first message, you can see i can fill in information in "CC Names", so I can customize what to display for the email address I write in CC (see below fig. for the illustration). It went well unless the throttle of this connector, 5 emails per 5 minutes, bother me much.

Therefore I switched to "Send an Email (v2)" connector from Office 365. As from the screenshot in my first message, there is no "CC Names" field for me to customize how the information being displayed. Since it is an email address from Teams, not in the directory, I tested and found it shows the full email address which is not nice.
What I want to ask here is, is there anyway I can add back the display names for the CC / BCC addresses.
Thanks and I look forward to the replies!