Hey @remington.keller.9969, welcome to the community! 
Unfortunately, there’s no current function to filter for DCUI ULTRA tier comics specifically. You can find the initial list of added comics here: DCUI ULTRA: Vertigo, Black Label, and Collected Editions! On the release threads, we also denote which comics are specific to DCUI ULTRA. You can find these threads here: New Comic Releases - DC Community.
I hope this helps! Please don’t hesitate to let us know if you have any further questions (thank you @Reaganfan78). 