Sending notifications to specific user with Expo - React Native - firebase

Question

Platform: React Native (IOS target)
Hi,
I am trying to build a way to send push notifications ( it's basically an app simillar to any datting app where you click a user and it sends them a notification to let them know I want to connect).
The notifications are being received fine on Expo Go but I don't know how to target a specific individual? Do I need backend for this?
This is my code:
const ProfilesScreen: React.FC<Props> = ({ navigation, route }) => {
const [expoPushToken, setExpoPushToken] = useState("");
const [notification, setNotification] = useState(false);
const [notificationRes, setNotifcationRes] = useState([]);
const notificationListener = useRef();
const responseListener = useRef();
const [data, setData] = useState<any>([]);
const [notificationsSentUids, setNotificationSentUids] = useState<any>([]);
const [notificationsCount, setNotificationsCount] = useState<number>(0);
const [activeIndex, setActiveIndex] = useState<number>(0);
const [storageData, setStorageData] = useState({});
async function sendPushNotification(expoPushToken) {
const message = {
to: expoPushToken,
sound: "default",
title: "My message",
body: storageData
? `${storageData?.name} wants to connect with you`
: null,
data: { someData: "goes here" },
};
await fetch("https://exp.host/--/api/v2/push/send", {
method: "POST",
headers: {
Accept: "application/json",
"Accept-encoding": "gzip, deflate",
"Content-Type": "application/json",
},
body: JSON.stringify(message),
});
}
async function registerForPushNotificationsAsync() {
let token;
if (Device.isDevice) {
const { status: existingStatus } =
await Notifications.getPermissionsAsync();
let finalStatus = existingStatus;
if (existingStatus !== "granted") {
const { status } = await Notifications.requestPermissionsAsync();
finalStatus = status;
}
if (finalStatus !== "granted") {
alert("Failed to get push token for push notification!");
return;
}
token = (await Notifications.getExpoPushTokenAsync()).data;
setExpoPushToken(token);
} else {
// alert("Must use physical device for Push Notifications");
}
return token;
}
useEffect(() => {
registerForPushNotificationsAsync().then(token => setExpoPushToken(token));
// This listener is fired whenever a notification is received while the app is foregrounded
notificationListener.current =
Notifications.addNotificationReceivedListener(notification => {
setNotification(notification);
});
// This listener is fired whenever a user taps on or interacts with a notification (works when app is foregrounded, backgrounded, or killed)
responseListener.current =
Notifications.addNotificationResponseReceivedListener(response => {
setNotifcationRes(response);
return () => {
Notifications.removeNotificationSubscription(
notificationListener.current
);
Notifications.removeNotificationSubscription(responseListener.current);
};
}, []);
return ....
};