Is it possible to add an icon to top tab navigator in React Native Router Flux?

I want to add an icon to every scene (tab) in the <Tabs></Tabs> component from react-native-router-flux.

I've noticed that the icons do indeed show when tabBarPosition="bottom".

My code looks similar to this:

<Stack>
  <Tabs tabBarPosition="top">
    <Scene icon={({focused}) => (
      <Icon name="star" />
    )} hideNavBar />
    <Scene icon={({focused}) => (
      <Icon name="audiotrack" />
    )} initial hideNavBar />
    <Scene icon={({focused}) => (
      <Icon name="album" />
    )} hideNavBar />
 </Tabs>
</Stack>

(Note that I've only included code related to my problem, nothing else)

Icons for Tab navigators with tabBarPosition={true} should be available in the component, as is evident in react-navigation's createMaterialTopTabNavigator as well as the documentation of react-native-router-flux, and I'm not sure if I'm doing something wrong or if this feature is not implemented for a reason.