USE [msdb]
GO
SELECT g.[name] AS [Group],
s.[name] AS [SQLAlias],
s.[server_name] AS [SQLInstance],
s.[description] AS [Description]
FROM [dbo].[sysmanagement_shared_server_groups_internal] g
LEFT JOIN [dbo].[sysmanagement_shared_registered_servers_internal] s
ON g.[server_group_id] = s.[server_group_id]
WHERE g.[server_type] = 0
AND g.[is_system_object] = 0
ORDER BY [Group], [SQLAlias]