Can I suggest you consider using a headless CMS for this? Might save you from reinventing the wheel with Firebase. And usually the output is just some JSON or similar that you can then cache locally in each app.
(Disclaimer: I work for one. But all of them should be able to do this, even the FOSS ones. I think it'll make the editor experience nicer for your content creators.)
(Disclaimer: I work for one. But all of them should be able to do this, even the FOSS ones. I think it'll make the editor experience nicer for your content creators.)