I would like to create a path, eg folder / subfolder in one call is it possible? This is how it works

import { File } from '@ionic-native/file';

createDirectory{
File.createDir(File.externalRootDirectory,'folder', true);
}

But if I try to create a subfolder at the same time, it doesn't work, can you help me?

    import { File } from '@ionic-native/file';

    createDirectory{
    File.createDir(File.externalRootDirectory,'folder/subfolder', true);
    }

Thanks