How to display a product image in the contact form on Bitrix?

Question

1C-Bitrix

On Bitrix there is a feedback form "Buy in 1 click". Made through the infoblock.
I added the "String" property "NEED_PRODUCT", and added it in the template. By analogy, I did the same for displaying the announcement image:data-autoload-need_product="<?=$arItem['NAME']?>"

• "String" property (the rest just doesn't fit) "NEED_PRODUCT_IMG"
  
• Code to Template

  data-autoload-need_product_img="<?=$arItem['PREVIEW_PICTURE']['SRC']?>"

  
  
• I also tried this code in the template

  data-autoload-need_product_img="<?=$arItem['PREVIEW_PICTURE']?>"

  
  

But the most that adequately turned out was the address of the image in the line.
Tell me what can be added or what type of property should be set to display images from the announcement?