Rollover preview of webflow site in iFrame refused

Is it possible to add certain URL’s to a “list with permitted websites” that can have access to a published webflow website.
When the user moves the mouse over a link in the page, I want to show a popup window which loads the page in link as preview. Currently it says:
"Refused to display ‘http://xyz’ in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors ‘self’ https://*.webflow.com "