How do you get a list of all pages with unknown macro errors in a Confluence Cloud instance?

[Gareth Hanekom]

We are in the process of migrating our content from Confluence Server to Confluence Cloud. Since we are using a few different apps on Cloud to what we had on Server, we have pages that will contain unknown-macro errors once migrated. 

Is there a simple way to retrieve a list of all pages that contain unknown-macro errors so that the page owners can replace those with macros provided in the Cloud instance?