Change slicer checkbox outline color?

[mmace1]

This must be simple, I'm just not seeing it.  

In a slicer, how does one change the outline color of the checkboxes? 

[StephenF]

Looks like this is missing.

[erhan_79]

As far as i have never seen an option like that , if there is it will be big surprise for me , just i wondered too 

[StefanoGrimaldi]

I havent see that option being avaible to modify on the format as far as I can tell. I double checked every option just in case on the normal filter visual isnt, you could create a coustom filter visual that let you modify that icon format.