You're right, I forgot that it is qlikview only.
What you can do is put the limitation directly into expressions.
Check the example - you can select the dimension and the result is only <=50% of Sum() of the selected dimension. I have it hardcoded but you can use variable. Disadvantage is that it also needs to be sorted by the same dimension because it uses Above().
That example is perfect in Qlik View. But in Qlik sense the Limitation option is quite rigid in terms of using 1st measure only.