Jabref uses bibtex as internal format, which is fairly standard. There are some apps on the play store if you search for "bibtex", though i personally haven't tried them.
I guess the main difficulty might be in regards to how you store the file links and associated files.
It can and I've used this as well to export from zotero, but there's a subtle difference in workflow between having to "export" your db in order to use it on another device (not to mention being bound to a browser extension) and having your db in a text based format that a multitude of software can directly work with.
I guess the main difficulty might be in regards to how you store the file links and associated files.