bin/stash/meta/stash_secure.cmx

{
    "program": {
        "binary": "bin/app",
        "args": [ "--secure", "--backing_file", "/data/stash_secure.store" ]
    },
    "sandbox": {
        "features": [ "persistent-storage" ],
        "services": [ "fuchsia.logger.LogSink" ]
    }
}