Allow widget access to document.referrer when embeded in iframe

Description of the issue:
At Ramp Network we are building widget for easy onboarding to crypto. Our clients embed our widget into their sites as an iframe. We would like to verify which client/host is operating given widget (some have custom features enabled) and we use document.referrer information as one of the mechanisms. This works fine in classic browsers, but in Brave this information is missing due to privacy protection mechanisms.
We’ve found that it’s possible to be whitelisted so that document.referrer information is present for our widget to use.
What is the process of being whitelisted? What information we should provide and where to send it?