We need to make changes to have BRN support the new architecture (TurboModules and Fabric). Docs start here: Prerequisites for Libraries · React Native
It is possible to make a RN module support both the old and the new architecture so it will work with either. Several RN OSS projects have done this, so there are examples we can follow.
Also, there is now a compatibility layer to enable RN modules that have not been migrated in the new architecture. Not everything is supported, but maybe everything that BRN uses. Someone should try it out: New Renderer Interop Layer · reactwg/react-native-new-architecture · Discussion #135 · GitHub