Srcset and Retina support

Using a3 lazy load to load these images results in a blurry images because WP Show Posts does not seem to support srcset or Retina

<img src="http://wp-bullet-guides.local/wp-content/uploads/2020/05/1.-Galbitang-Beef-Short-Rib-Soup-220x330.jpg" alt="tost" itemprop="image" class="center">

Would be great if this plugin supported srcset and size attributes, maybe a CSS class to track the images as well?

Something like

<img src="http://wp-bullet-guides.local/wp-content/uploads/2020/05/1.-Galbitang-Beef-Short-Rib-Soup-220x330.jpg" alt="tost" itemprop="image" class="wp-show-posts-image center" srcset="" sizes="">