LayerStyles / Appearance API

Hi, I'm trying to generate our color palette in sketch with react-sketchapp, from the documentation react-sketchapp supports Symbols and TextStyles, what about layer styles?

Example: I can run the color palette example, but each element of the palette only has direct styles applied to it, I'd like to use layer styles like this 👇

Any pointers would be appreciated, otherwise I guess I'll have to use sketch's low level api?