How do I pass a Prop to a Navigation Screen Component - React Native

Asad's Answer actually helped me get to this :

App.js (Navigation)

Here, we can add the 'initialParams' parameter to <Drawer.Screen/> :

 <Drawer.Screen
    name="Login"
    component={LoginScreen}
    initialParams={{ post: this.state.isAdmin }} //<-- Right here
 />

Then we can receive as such in LoginScreen.js as such :

const LoginScreen = ({ navigation, route }) => {

    console.log(route.params.post)
    return (
        <Text>{route.params.post}</Text>
    )
}