Data-url need to be set as attribute for all needed images separately. Want to set this for all possible images at once? You can use PRO plugin version to set custom value for shared URL or just use following code snippet:
add_action('wp_footer', 'my_wp_footer2');
function my_wp_footer2() { ?>
<script>
window.addEventListener('load', function() {
function sti_data( data ) {
data.page = data.media;
return data;
}
if ( typeof StiHooks === 'object' && typeof StiHooks.add_filter === 'function' ) {
StiHooks.add_filter( 'sti_data', sti_data );
}
}, false);
</script>
<?php }
This will share a link that will lead directly to the shared image.