here is the documentation for supporting plugins on the mobile app:
https://docs.google.com/document/d/1VnmhyJFhbnsfDJwjHYQy9yOzkbNsfsXD5kuSns9V3K4/edit#heading=h.swhxeed4lfcm
Please note that some changes are not integrated yet on Moodle 3.5 so there could be minor changes (in the PHP part)
Please, remember also that this will require your site to be updated to Moodle 3.5 or to use the Moodle Mobile additional features plugin.
If you have any doubt, please use this forum