FRR is supports redistribute Non-main Kernel Routing Table via bgp.
1.3-n(config)# router bgp 4200000001 1.3-n(config-router)# address-family ipv4 1.3-n(config-router-af)# redistribute table 50
But VyOS don't support this option
[email protected]# set protocols bgp 4200000001 address-family ipv4-unicast redistribute Possible completions: > connected Redistribute connected routes into BGP > kernel Redistribute kernel routes into BGP > ospf Redistribute OSPF routes into BGP > rip Redistribute RIP routes into BGP > static Redistribute static routes into BG