If the H5P activities don't need assessment, you can display them in the Moodle Mobile app by hosting them on a Wordpress site. The embedded item in your Moodle site will show perfectly in the Mobile app.
We use a dedicated Wordpress site with the H5P plugin to make all our content (if it needs assessment then we simply export it and upload it to the Moodle H5P plugin) and find this a much simpler solution.
Hope that helps.