How to use the embed plugin element in Wix blocks

Question:
I am creating a custom widget in Wix blocks for my product page. I want to showcase reviews for the product opened. I wanted to use the embed plugin (previously called slots) element available in wix blocks, I am unable to understand how the element works.

Product:
Wix studio, Wix blocks

What are you trying to achieve:
I want to use the default wix reviews app to gain the product reviews and than the widget should show the reviews in the embed plugin element (Slot) . It would really help to understand how the element works, what kind if arguments should I pass to it?

What have you already tried:
When the element is added I can see that the element has the functionality to display content from default wix apps which are available on the store, but below it also shows that I have to code something for it. I tried searching for documentation related to it but was unable to find anything. I can see a option to set default plugin for it but when clicked shows “wait for update” .

Would really appreciate the help!! Thanks in advance!!