Take Specific Value Inside BGP Community

Hi, Is it possible in bird to copy specific value inside BGP Community? Example: Route 1, Community (a,b,c) -> inbound Route 2, Community (a,b,d) -> inbound -- Route 1, Community (k,l,c) -> outbound Route 2, Community (k,l,d) -> outbound The specific value I want to preserve is c and d, and it is dynamic variable. whatever c and d inbound, copy to c and d outbound. Thanks. Ilham [5f622eb5-c189-4e05-8584-e4a1d2071a6b]