The checklist activity does not currently include any webservice functions for getting data out of it (or, for that matter, for adding data to it).
It is something that could be developed (and once I've released a new version of the plugin, I assume MoodleCloud would update to use it). However, it'll probably be a while (if ever) before I get around to doing it in my spare time - if another developer wanted to propose a patch that did this, I'd be happy to review it for inclusion.
It is something that could be developed (and once I've released a new version of the plugin, I assume MoodleCloud would update to use it). However, it'll probably be a while (if ever) before I get around to doing it in my spare time - if another developer wanted to propose a patch that did this, I'd be happy to review it for inclusion.