Storage Backend Recommendations?

I need a unified backend data storage for my project. Does anyone one know of the least painful path to achieve this?

I checked firebase but it seems their Cocos SDK is only C++ which I have no clue about.
I also checked if there was anything I could use from SDK box but the closest I could find is leaderboards which is really too shallow for my needs.

Really I want to just save a big dump of various data that anyone with the app can read/write to.