Hi. I also ran into this, so I studied the icon from the JXL plugin and was able to get the following to work for me (after removing fill/stroke styling from my paths, etc):
<svg viewBox="0 0 24 24" width="24" height="24" xmlns="http://www.w3.org/2000/svg">
<style>
path, ellipse {
stroke: #42526E;
}
@supports (color-scheme: light) and (color-scheme: dark) {
svg {
color-scheme: light dark;
}
@media (prefers-color-scheme: light) {
path, ellipse {
stroke: #44546F;
fill: #FFF;
}
}
@media (prefers-color-scheme: dark) {
path, ellipse {
stroke: #9FADBC;
fill: #1D2125;
}
}
}
</style>
...