You can write the code in custom Liquid, but if you expect to display banners frequently, we recommend setting it up as block content.
By including a banner in the product description box, you can increase the chances of it being seen by users who are considering purchasing.
Example of adding a block that can display a banner image in the product description frame on the product detail page of the theme "Dawn/Rise"

[(For the Rise theme) Setting procedure ①] Add the schema to "sections/main-product.liquid" and the label to "ja.schema.json"

[(For the Rise theme) Setting procedure ②] Add the code to "sections/main-product.liquid"

[Settings (for the Rise/Dawn theme)] Add a block to the product information section of the product details template and set the image and link destination.

