found the solution just after posting the question. I used " instead of other solution. 

<li data-cmp-data-layer="{"$entity.id" :{image:$entity.thumbnailUrl,@type:$resourceType,title:$entity.name,descriptions:$entity.message}}" data-cmp-clickable class="card" ></li> Result in html in browser:<li data-cmp-data-layer="{" card-items-3fbe5ed156"="" :{image:https:="" www.visitsaudi.com="" co...

Hi, Custom code looks fine.Do you have URL to look this issue? Regards,Rajan