Accessing "Capture to wiki" details via REST?

When you go to a ForumThread there is an option to "Capture to wiki".  This feature generates a WikiPage from the ForumThread content and then links the ForumThread to the WikiPage.

I reviewed the JSON data for both the ForumThread and WikiPage and there doesn't seem to be any data in those objects that show the link, so it looks like there is some other association object that stores that data.

My question: How can I access (and maybe create/delete) the ForumThread-WikiPage association data via REST?

Overall the goal is to report on all ForumThreads that are associated with a WikiPage.  I would also be interested on if there is some other way to report on that.