Thank you for reaching out.
Per your description, I understand that you would like to add the assignee column to the linked issue section of your JIRA issue view:
If that's the feature you are looking for, I'm afraid Jira does not have the option to customize those columns at this moment, however, we understand how useful this option would be and created a feature request to get it implemented:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
As a workaround, there are some third-party apps that provide you with that functionality, like Issue Matrix for JIRA.
Let us know if you have any questions.
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