adding multiple urls to icloud keychain item?

Is there a way to add multiple urls to a iCloud Keychain item?

For example:

I got two entries for Mozilla, one is for accounts.firefox.com and the other one is for mozilla.org.

Is there some way to add one of the urls to the other.

I See it for example twitter.com has multiple urls in the iCloud Keychain, but there seems no way to edit them manually.