No clue if a roadmap exists (too hectic these days?) , but you can probably look at the current PRs and see what's being merged into the app
https://github.com/dessalines/jerboa/pulls
There isn't exactly a roadmap at this point, its sorta a free-for-all with lots of people implementing the features they want. Making issues on github definitely helps visibility and will help it be prioritized once the app is in a more complete state.