In Epic issue can we add more columns under linked issues

[siva]

We are using Jira server 9.4.5, and I need to add a new column in the Epic issues section (custom field ID is customfield_10105). During my research, I discovered a community discussion about his issue at the link below.

https://community.atlassian.com/t5/Jira-questions/How-do-you-add-a-column-to-quot-Issues-in-Epic-quot-panel/qaq-p/292561?_ga=2.184756393.142173867.1681091048-817861747.1681091048 

I tried to add the script in announcement banner but nothing added in my epic table and here the script screen shot below

Please let me know where I need to make changes to the script. I’m new to scripting, so any assistance would be greatly appreciated.
Thanks,
Siv