How can you update label type in Servicedesk using REST API?

[TooManyFormChecks]

I am having trouble adding a component to a label type in Jira.

import browser_cookie3
import requests
import json

cj = browser_cookie3.load()
url = ""

text = {'fields': {'customfield_xxxx':['test']}}

r = requests.put(url, json=text, cookies=cj)

print(r.status_code)

With the above code, I can update the label list. However, I need to achieve the following - The label contains[ ABC, 123 ] and I want to add component [ZXC] to the existing list. My goal is to have[ABC, 123, ZXC] but with the above shown code it updates to - [ZXC]

I did find that in editmeta there is "add" function for the customfield, however, I was unable to make it work.

Thank you in advance!

[Dirk Ronsmans · Accepted solution]

Hi @TooManyFormChecks ,

The JSON you need to use is as follows:

{
 "update": {
    "labels": [{
       "add": "test_2"
              }]
           }
}

This will add the label "test_2" but not overwrite the whole field. 

[TooManyFormChecks]

Thank you so much! I was so close as well! I had fields but I needed to place update! Also, it could be that I tried this and was not working because I was using /rest/api/2/issue/ISSUEKEY/editmeta but I did not need to append it with editmeta. Once again, thank you very much !