Get video thumbnail URI in twig theme template

I'm trying to get the youtube thumbnail URI in Drupal 8 twig view template so that I can use it as a CSS background for a div element rather than directly on the page in an img tag.

I see that I can find the URI using a preprocess function, but I can not figure out how to get the URI into the view template. Then for it to only apply to the specific content type I'm using.

themename.theme:

function THEMENAME_preprocess_image(&$variables) {
	$variables['uri']
}

I was able to get it working by using '{{ fields.field_youtube.content }}' in the view template then setting the 'image.html.twig' template to only return '{{ attributes.src }}', however, this would target all images that happen to be using the global 'image.html.twig' template.

Is there a more appropriate way to get the youtube thumbnail URI into a twig view template?

Thank you.