Insert custom url event variable into a campaign

Hey,

We use Trustpilot to gather product reviews, (this is historic before we moved to Klaviyo).

For customers who have forgotten to review a product or didn’t feel the time was right or reviewed just our service. I’d like to invite them again to review the product in a more personalised way using a campaign.

Trustpilot generates a custom url and invites people who have purchased. Once they click on the URL the product is displayed and it ensures; they review the correct product; the review gets a verified purchase check & goes to the email address associated with the order.

Is it possible to add a custom property (the unique url) to the customer profile and then insert that into a campaign?

(As an aside, I am looking into Klaviyo Reviews & I am aware of Trustpilot Integration but this is just to display existing reviews not gather new ones). 

Thanks,

Claire