React Native - initialProperties Android

I'm working under React-Native and I'm looking for passing initial props to JS via Java. This can be done easily in Objective-C with initialProperties like this :

RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:@"myapp"
                                               initialProperties:initialProperties
                                                   launchOptions:launchOptions];

Where initialProperties is an NSDictionary which will be converted in JSON and available in JS via this.props. So I'm looking to do the same in Android. Any help ? Thanks