Change font color and size in a combi chart

[Marcusdoering]

Hello together,

I have a small problem. I already searched the web but in do not find any solution.

In a combined bar line chart the colors of bars make the values of the line unreadable.

I try to change the color and size of the numbers of the line chart but I was not able the change anything.

I don't want to change the complete app. 

Is there an option to change the numbers (size, color, background color)?

Thanks for your help

Cheers

Marcus