Is there an easy way to append a new contact to an existing group contact, without overwriting the existing dlist members?


Code:
zimbra@host.com#  zmmailbox -z -m someaccount@host.com gact -v
...
     "attrs": {
          "dlist": "\"Test1 User\" <test1@host.com>, \"Test2 User\" <test2@host.com>",
          "fileAs": "8:Zimbra Testers",
          "nickname": "Zimbra Testers",
          "type": "group" 
     },
     "id": "1164667",
...

I can do the following, but it overwrites the current dlist members.

Code:
zmmailbox -z -m someaccount@host.com mcta 1164667 dlist "\"Test3 User\" <test3@host.com>"
I understand I can fetch and modify the 'dlist', but is there another method to just "append" to it?