How to change color of arrows (nestible slider) directly in the builder?

Hello,
is it possible to change the color of the arrows of a nestible slider directly in the builder?
I have successfully tested the possibility with custom code in the settings with this rule:
.brxe-slider-nested .splide__arrows svg {
stroke: none;
fill: #fff;
}
But of course it would be more practical to be able to set that in the builder…