Help!/Inserting prequels in the story infobox

I have noticed that a few Doctor Who stories have prequel webcasts. However, they go overlooked in the story infoboxes.

Should there be a content template in the story infobox that lists this type of media? Say, for example, we have the Confidential row set aside for the companion episode of DWC in the infobox. How would a prequel or prequels be addressed?