Variable prompt for a request run via runRequest

[bqback]

Let's stay I have a GET request named /book/get_by_uuid to example.com/book/{{?UUID}}. In a different request in the same collection (but in a separate folder!), I'd like to call runRequest("/book/get_by_uuid") and extract some of the values for the body of the second request.

I've discovered that calling the request as described doesn't prompt for the variable at all, and /book/get_by_uuid is called with an empty string.

I could probably achieve a similar result by using bru.setVar('bookUuid', {{?UUID}}) in the Pre-Request Script section, but I'm not aware of a way to allow /book/get_by_uuid both use a variable like bookUuid and prompt for {{?UUID}}, besides maybe a script, which feels like extra work in the wrong direction.