ID of items within an element

I think you will never get an answer to your question! Why???

  1. You do not provide your current working (not working code).
  2. You do not describe your project setup (which elements are used for example).
  3. You also do not describe in detail the flow of your project.

And on the top, working with APPs, → you are talking about → PRODUCT-PAGE ← → and this is a part of the → Wix-Stores-App <–, not everything is possible, when working with predefined apps.

Take a look in the VELO-API-DOCS, and find all provided APIs, which hits your situation.

https://www.wix.com/velo/reference/