SQL Server view with [with, distinct, STRING_AGG] - sql

Question

I would like to add an distinct concatenated string for each row to this view.
SELECT
i.Id, i.Name, oavName.AttributeValue AS BelongingToName,
ie.ExecutionDate, i.Categories
FROM
dbo.[GAB.Inspection] AS i
INNER JOIN
dbo.Object AS o ON o.Id = i.ObjectId
INNER JOIN
dbo.ObjectHistory AS oh ON oh.ObjectId = o.Id
AND oh.IsLast = 'true'
LEFT OUTER JOIN
dbo.[GAB.InspectionExecution] AS ie ON i.Id = ie.InspectionId
AND ie.IsLast = 'true'
INNER JOIN
dbo.ObjectAttributeValue AS oavName ON oavName.ObjectHistoryId = oh.Id
INNER JOIN
dbo.ObjectAttributeTemplate AS oatName ON oavName.ObjectAttributeTemplateId = oatName.Id
AND oatName.AttributeLabel = 'Name'
This returns the following result:
+----+-----------------+------------------+---------------+------------+
| Id | Name | BelongingToName | ExecutionDate | Categories |
+----+-----------------+------------------+---------------+------------+
| 1 | Demo Inspection | Demo Main Object | 2022-04-14 | DemoCat |
+----+-----------------+------------------+---------------+------------+
Now I have an other table where I get all the available intervals in it like this:
SELECT InspectionId, Turnus AS Interval
FROM [GAB.QuestionTemplate]
Result:
+--------------+----------+
| InspectionId | Interval |
+--------------+----------+
| 1 | 1 |
| 1 | 1 |
| 1 | 1 |
| 1 | 5 |
| 1 | 5 |
+--------------+----------+
And distincted
SELECT InspectionId, Turnus AS Interval
FROM [GAB.QuestionTemplate]
GROUP BY InspectionId, Turnus AS Interval
+--------------+----------+
| InspectionId | Interval |
+--------------+----------+
| 1 | 1 |
| 1 | 5 |
+--------------+----------+
So far so good... Now what I need is an concatenated String based on the Intervals.
WITH Turnusse AS
(
SELECT Turnus
FROM [GAB.QuestionTemplate]
GROUP BY Turnus
)
SELECT
STRING_AGG(ISNULL(Turnus, ' '), ';') WITHIN GROUP (ORDER BY Turnus ASC) AS Intervals
FROM
Turnusse
Result:
+-----------+
| Intervals |
+-----------+
| 1;5 |
+-----------+
What I now need is to add this Intervals belonging to the InspectionId as an separate column in the view.
Should look like this then:
+----+-----------------+------------------+---------------+------------+-----------+
| Id | Name | BelongingToName | ExecutionDate | Categories | Intervals |
+----+-----------------+------------------+---------------+------------+-----------+
| 1 | Demo Inspection | Demo Main Object | 2022-04-14 | DemoCat | 1;5 |
+----+-----------------+------------------+---------------+------------+-----------+
This is what I don't get... How can I implement the STRING_AGG into the view to give the expected output?
The table [GAB.QuestionTemplate] has the InspectionId which is the i.Id in the view.