[Forums] Label at Plotline in Linechart

Hallo Everybody, 

I try to set a label to a plotline in a linechart, but the label is not shown.

I added the following code to the xAxisJSON in the AdvancedFormat variable of the chart:

SyntaxEditor Code Snippet

plotLines: [{
            color: 'black',
            width: 2,
            value: 120,
            zIndex: 99, 
            label: {
                text: 'Max. Activity Rate: 120',
                rotation: 0,
                verticalAlign: 'top',
               
                    }
        }]

 The plotline appears as expected, but the label is still missed. Has anybody a hint what I'm making wrong? 

Thanks Daniel