Hi @Meduardamay for the browse abandonment specifically, if you use the viewed product tracking shared by klaviyo it will push Name (title), productid (itemid), categories, imageURL and URL, Brand, Price, compareAtPrice as metadata. If you want to extend this than you should improve the standard viewed product tracking script to include what you want it to send to Klaviyo. But remember this will send a single productview to Klaviyo each time a product get's viewed, unlike abandoned cart that can have multiple products in the event.
More info on adding the Viewed Product tracking on shopify
https://help.klaviyo.com/hc/en-us/articles/115005080407#how-to-add-viewed-product-tracking-12
If you want specific size, color etc then you might be better of using an “added to cart” tracker that sends the specific product someone added to their cart which does have these data points.
Hope it helps and makes sense?
Omar Lovert
Klaviyo Specialist
Polaris Growth
Helping E-commerce brands maximize Lifetime Value & Profits with Klaviyo, CRO & CVO - Get your free Audit - https://link.polarisgrowth.com/free-audit