How can i get oath Token and idToken from open with facebook single sign on

[bala.expo.testaccoun]

I am able to retrieve user information but i am unable to get oath token and idtoken to send to my backend. How can i get those info like that of Google Sign In which returns me idtoken and oathtoken using AppAuth library.

Below code for reference.

import React, { Component } from 'react';
import { Image, Button, StyleSheet, Text, View, AsyncStorage } from 'react-native';

import { AuthSession } from 'expo';

const FB_APP_ID = 'some_app_id';

export default class FacebookLogin extends Component {
    accessToken: any;
    constructor(props) {
        super(props);
        this.accessToken = ''
    }
    state = {
        userInfo: null,
    };

    render() {
        return (
            <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
                {!this.state.userInfo ? (
                    <View style={styles.login_facebook}>
                        <Button color="#fff" title="Login with facebook" onPress={this._handlePressAsync} ></Button>
                    </View>

                ) : (
                        this._renderUserInfo()
                    )}
            </View>
        );
    }

    _renderUserInfo = () => {
        return (
            <View style={{ alignItems: 'center' }}>
                <Image
                    source={{ uri: this.state.userInfo.picture.data.url }}
                    style={{ width: 100, height: 100, borderRadius: 50 }}
                />
                <Text style={{ fontSize: 20 }}>{this.state.userInfo.name}</Text>
                <Text>ID: {this.state.userInfo.id}</Text>
                <Button title="logout" onPress={this.logOutFromFacebook}></Button>
            </View>
        );
    };

    logOutFromFacebook = async () => {
        AsyncStorage.clear();
        AsyncStorage.getItem('token').then((res) => console.log("token from asynstorage after logout " + res))
    }

    _handlePressAsync = async () => {
        let redirectUrl = AuthSession.getRedirectUrl();

        // You need to add this url to your authorized redirect urls on your Facebook app
        console.log({
            redirectUrl
        });

        // NOTICE: Please do not actually request the token on the client (see:
        // response_type=token in the authUrl), it is not secure. Request a code
        // instead, and use this flow:
        // https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow/#confirm
        // The code here is simplified for the sake of demonstration. If you are
        // just prototyping then you don't need to concern yourself with this and
        // can copy this example, but be aware that this is not safe in production.

        let result = await AuthSession.startAsync({
            authUrl:
                `https://www.facebook.com/v2.8/dialog/oauth?response_type=token` +
                `&client_id=${FB_APP_ID}` +
                `&redirect_uri=${encodeURIComponent(redirectUrl)}`,
        });

        if (result.type !== 'success') {
            alert('Uh oh, something went wrong');
            return;
        }

        this.accessToken = result.params.access_token;
        let userInfoResponse = await fetch(
            `https://graph.facebook.com/me?access_token=${this.accessToken}&fields=id,name,picture.type(large)`
        );
        const userInfo = await userInfoResponse.json();
        AsyncStorage.setItem('token', this.accessToken);
        this.setState({ userInfo }, () => {
            console.log("Userifno" + JSON.stringify(userInfo))
        });
        AsyncStorage.getItem('token').then((res) => console.log("token from asynstorage " + res))
    };
}
const styles = StyleSheet.create({
    login_facebook: {
        backgroundColor: '#4C69BA',
        padding: 6,
        color: 'white'
    },
})