Reference to Custom Context Data in Interstitials

I am using Adobe Mobile Services, and I have defined custom context data in the "Add Tracking Context Data" section.  When "Use Universal Links or App Links" is selected, the custom context data (with ctx prepended) is attached in the URL.

I would like to switch to interstitials.    Are there any means that I can reference the custom context data in the interstitials?

Thank you very much.