Not easily.... here's a possible workaround...
You can create an email to the person, add the group to the CC: field
Save the message as a draft, File - Save
Close the message (do not send it).
Open the message in the Drafts folder.
Now you can see all of the recipients in the CC: field.
Highlight them, copy and paste into the message body.
Delete them from the CC: field.
Edit as necessary & Send.
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