Passing cloudinary parameters JS parsing issue

Trying to pass multiple parameters into Cloudinary fetch. The JS is parsing it at the comma and treating it as two separate URLs. Wondering if this is a Ghost issue or a theme issue. Any ideas of an alternative solution would be great.

<div class="m-article-card__picture lozad" data-background-image=",w_600/{{img_url feature_image}}">

This is what it generates:
url(""), url("w_600/");

This is what I would like it to generate:

-Ghost Version 3.16.1
-Liebling Theme
-Cloudinary Storage Object
-Happening in all Browsers