I think adding a line to Jannah implying that Finn was a known figure amongst the stormtroopers and was at least partly why they were inspired to rebel would be a nice way to suggest the stormtrooper rebellion plotline. Having Jannah know who Finn is makes her more willing to trust him and have him lead the squad into battle later. Something like:

FINN: I never knew there were more.

JANNAH: Deserters. We all heard your story.

Not sure if there’s enough material from Jannah to get a good reading, though.