Useful method missing like storage.chrome.get([value1, value2, value3], () => {})

The method get works fine, but I missed a method like chrome, not to get all data, but get only specific data, actually I'm using `storage.chrome.get` api and `JSON.parse()` but my own.

If there's a possibility for this method to be add, let me know. 

I can work in this and implement this method.

Thnks