Dear Hanshika,
As you know, below is the product syntax.
"Category;Product;Quantity;Price;eventN=X[|eventN2=X2];eVarN=merch_category[|eVarN2=merch_category2]"
To capture Review Counts as dimension, you should enable Merchandising for the variable as pointed out earlier and use an eVarN (Last delimiter value).
To capture Review Counts as event, you should just use an eventN (Second last delimiter value).
But, based on your objective you should capture it in a dimension and not in an event.
If you capture it in an event, it will sum all the Review Counts & not by last Review Count.
Example:
Customer applying a product "A" on 13 Dec 2017 with review count 8 (Review Count as on 13 Dec).
Customer applying a product "A" on 14 Dec 2017 with review count 9 (Review Count as on 14 Dec).
Customer applying a product "A" on 15 Dec 2017 with review count 10 (Review Count as on 15 Dec).
Then, table will be like,
Product | Review Count (Metric) |
A | 27 |
So, you cannot find your base goal : Impact of product reviews on conversion rate.
Thank You!
Arun