Is it possible to get a list which does this: Task with Category = Ausstattung and sort them in relation to the issue linking which of the Category = Ausstattung has the fewest number of task with Category = Artikel which is has not the Status "Fertig"
JQL is not ready for this kind of "complex" queries.
The workaround is that you implement a "Number" type calculated custom field called "Foobar" which calculates the number of linked issues with whatever criteria.
Then you can order intuitively using "ORDER BY Foobar".
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