How to get jira columns of Issue Link Panel

Hi,

I want to get the columns of Issue Link Panel in java code.
I know the way to get the columns of Subtask Panel ( jira.table.cols.subtasks) is:

List<String> userSpecifiedColumns = tableLayoutUtils
.getDefaultColumnNames(APKeys.ISSUE_TABLE_COLS_SUBTASK);

But I don’t know how to get all columns of Issue Link Panel

Thank a lot,