如何在顶端导航器中显示标签 BarBadge

const TopTabNav = ({ route }) => {
  const {
     notifications
    } = route.params;
  return (
    <NetworkContext.Provider value={route.params}>
      <TopTab.Navigator>
        <TopTab.Screen
          name="Home"
          component={Home}
        />
        <TopTab.Screen
          name="Settings"
          component={Settings}
          options={{
            tabBarBadge: notifications.length,
          }}
        />
      </TopTab.Navigator>
    </NetworkContext.Provider>
  );
};