Line diagram with multiple lines

You may be able to get the desired result by using the concatenated Variabelen as the legend. 
The problem then becomes all the data is loaded into the visual when there is no selection from any of the slicers.

You can get around this by amending your measure to test for filtering from any of the slicers and return a blank if no filtering is selected. 

Example:

Punten Sum =

var _sum =

SUM('Table (2)'[Punten])

var _result =

SWITCH(

    TRUE(),

    ISFILTERED('Table (2)'[Stad]), _sum,

    ISFILTERED('Table (2)'[Waarde]), _sum,

    ISFILTERED('Table (2)'[Label]), _sum,

    BLANK()

)

Return

_result

 

Now with a blank visual the user may need some prompting, so you can create a conditional title that tells the user to select a slicer to be able to see data.

 

I created a very small sample set to illustrate.

 

The conditional title measure I used was

 

Title Text =

var _blank =

"Please select slicer to view data"

var _title =

"ACTUAL CHART TITLE"

var _testStad =

IF(ISFILTERED('Table (2)'[Stad]),1,0)

var _testWaarde =

IF(ISFILTERED('Table (2)'[Waarde]),1,0)

var _testLabel =

IF(ISFILTERED('Table (2)'[Label]),1,0)

Return

IF(_testLabel+_testStad+_testWaarde>0,_title,_blank)

 

This is not a crisp solution, but it should get you going in the right direction.

For the visual I have:

1st Measure

2nd Measure

The title measure is then put in the conditional formatting cell of the visual