CEA608 captions injected with scroll-up. Cues disappear too quickly

Some people I am working with have built a live captions feature injecting onTextData captions into the HLS streams. However there is an issue with single lines of cues and they dissapear quick.

Is there a way to have wowza keep cues for a certain duration and scroll up to show the next cue ?

I have a demo HLS showing scroll-up but cant link to it.