I have a SQL query that contains the following line of code:

GROUP_CONCAT(CASE WHEN t3.ship=1 AND t4.item=0 THEN t2.item_name END ORDER BY item_id SEPARATOR '
') `My Item List`

The current output is: Lamp. It's working fine, but I want the item number stored in the item_no column to be displayed in the list. The desired output is: 1. Lamp. I tried adding some code like this without success:

GROUP_CONCAT(CASE WHEN t3.ship=1 AND t4.item=0 THEN t2.item_no, '.' ,t2.item_name END ORDER BY item_id SEPARATOR ' 
') `My Item List`

How to achieve it?