Hello,
Here is what I would like to have this :

but i get this :

This is my SQL code :
SELECT T1.'T',T1.'Key',T1.'Summary', T1.'Linked Issues', T1.'Date prévue',
CONCAT(FORMATWIKI(T2.'T' , " \n")) AS 'T-linked issues',
CONCAT(FORMATWIKI(T2.'Key', " \n")) AS 'Key-linked issues',
CONCAT(FORMATWIKI(T2.'Summary', " \n")) AS 'Summary-linked issues',
CONCAT(FORMATWIKI(T2.'Status', " \n")) AS 'Status-linked issues'
FROM T1 LEFT JOIN T2 ON T1.'Linked Issues'->split(" , ")->indexOf(T2.'Key'::string) > -1
GROUP BY T1.'Key', T1.'T',T1.'Summary', T1.'Linked Issues', T1.'Date prévue'
The version of Confluence I use is :
Confluence 7.13.7
Can you help me ?