How to prevent auto-formatting vue-loader's deep selectors?

When reformatting code in `.vue` files, vue-loaders deep selectors `>>>` get spacing between them like so: `> > >`, which in effect breaks their functionality. Is there any way to prevent it from happening?
Currently I'm using `@formatter` comments so they are not reformatted, but it's tiresome: 

<style scoped>

//@formatter:off
>>> .custom {//@formatter:on
 transition: none;
}
</style>

I'd like to just add custom formatting ignore option for `>>>` selectors (as a custom input perhaps), but couldn't find how or if it's possible.