Get map field meta data (lang and long)

Hi. This code works great to show markers from my lat and long field. Now, how do instead use the coordinates direct from my map field?

function display_google_map() {
// Hämta alla inlägg från Custom Post Type 'stationer'
$stations = new WP_Query(array('post_type' => 'station', 'posts_per_page' => -1));
?>
<div id="map" style="width: 100%; height: 500px;"></div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAdc9p_FnrdVKuIW-txjCmc6s429pKBcj0"></script>
<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: 59.3293, lng: 18.0686} // Stockholm som centrering
});

var markers = [
<?php
if ($stations->have_posts()) :
while ($stations->have_posts()) : $stations->the_post();
// Hämta lat och long från de separata fälten
$latitude = get_post_meta(get_the_ID(), 'lat', true);
$longitude = get_post_meta(get_the_ID(), 'long', true);
if ($latitude && $longitude) {
echo "{lat: $latitude, lng: $longitude, title: '" . get_the_title() . "'},";
}
endwhile;
wp_reset_postdata();
endif;
?>
];

markers.forEach(function(marker) {
new google.maps.Marker({
position: {lat: marker.lat, lng: marker.lng},
map: map,
title: marker.title
});
});
}

window.onload = initMap;
</script>
<?php
}
add_shortcode('google_map', 'display_google_map');