SQL & PL/SQL

I have a query to display some values. I used LISTAGG statement. But the output I expect is little different. Please help me out.

Select EMP_NAME, EMP_SKILL, LISTAGG(SUBJECT_NAME, ', ')

WITHIN GROUP (ORDER BY EMP_SKILL) as EMP_SUBJECT_SKILL fromEMPLOYEE group by  EMP_NAME, EMP_SKILL;

Actual Output:

Expected Output:

I already read a post but I could not achieve it. Could anyone please suggest how to do it.

Thanks in advance.