[dev] Feeding raw BGP path data to custom backend

Hi, I am new to FRR. Pardon me if this is not the right forum to ask this question. We are interested in using the BGP component of the FRR package. I have a few questions on how we can customize it for our special use case. What we would like to do is 1. turn off Zebra interface as we are not interested in the route computation or sending those routes to Kernel. 2. send BGP post-policy path data to the backend "Watcher" that knows how to handle special cases based on custom community information. Further, is there support for EVPN (type 5) in FRR implementation? Has anyone attempted to feed raw path data (post policy) to a backend Watcher? Appreciate any input. Thank you in advance. Ravi