Access the url of the image of the advert

Hello, how can I access the url of the image of the advert and then use it.
To better understand what I want I do the same but with blog posts , I use the image for the banner.

$thumb_url = get_the_post_thumbnail_url( $thumb_size );
$thumb_style = is_single() && has_post_thumbnail() ? 'style="background: url('.$thumb_url .') no-repeat scroll center center / cover"':'';
<div <?php echo $thumb_style;?> class="banner theme-banner-breadcrumb">

How could I do this in the ads?

 

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