SB - Add Option for Subscribing to Accessories on Product Pages

Currently, users can only subscribe to the main product on the product page, but the merchant wants the ability for customers to subscribe to accessories (e.g., brush heads for an electric toothbrush) directly from the product page of the main item. This feature would allow the accessory subscription to be presented alongside the main product, offering a more seamless shopping experience.

This feature would eliminate the need for a separate checkout link and allow the customer to easily select and subscribe to the accessory while purchasing the main product. The goal is to enhance the user experience by clearly displaying subscription options for related accessories, directly on the product page, making it more intuitive and convenient for shoppers.