json from resource

1. There is no documentation only one example...

2. It's from 2.3 CIQ but for all device?

3. How it works?

-  what is returned from loadResource(resourceId_jsonres)? dictionary?

- memory usage. After loading json_res in function to local var is memory released after exiting from func? or happens something like with string_res - memory is occupied until app exit?