Writing a custom scroll view

[yogeshpaliyal]

Hi everyone,
I’m working on adding custom functionality to a ScrollView—specifically viewability tracking for its items—using the New Architecture (Fabric).
In the Old Architecture, this was straightforward: I’d just copy the existing ScrollView code/manager, tweak it, add my @ReactMethod hooks, and register it under a new name.
However, I’m hitting roadblocks on RN 0.80.2 (Brownfield app):

1. C++ Customization: I tried extending the ScrollView descriptor in C++ and registering it under a new name. It helped a bit, but the scrolling is now glitchy and "jumpy."
2. View Manager Overriding: I tried keeping the name as RCTScrollView and registering my package before MainReactPackage. While it picks up my manager, the additional ReactMethods I created are never invoked.
   Has anyone successfully extended the Fabric ScrollView or found a reliable way to hook into its scroll events for viewability in the New Arch?
   Any advice would be greatly appreciated!