At this moment, this targeting is API only.
The Interstitial targeting allows you to target your line items for the interstitial placement type. Interstitial ads appear on websites and in apps during logical breaks, such as video scenes, game activities and such. Unlike other ad types, interstitial ads are full-screen.
You can include the Interstitial placement in your targeting or exclude it. You can also target both interstitial and non-interstitial placement. By default your line items are targeted on both placements.
Is Interstitial Ad and
Is Interstitial Video reporting keys to
analyze performance in u-Slicer.