i have an object stored inside chrome storage that looks like this:
{ \"planA\": { 123: {key: \'some key\'} 124: {key: \'some other
You can't do that in a single API call. The API only gives access to top-level keys: you can get or set planA as a whole.
planA
So you'll need to write your own get/set functions, that retrieve the required top-level key, modify the object as required, and save it back.