You mean this existing option, or I am missing something?
vyos@vyos-suri:~$ conf [edit] vyos@vyos-suri# set int eth eth0 description TEST [edit] vyos@vyos-suri# set serv ssh port 8877 [edit] vyos@vyos-suri# set system host-name foo [edit] vyos@vyos-suri# compare [interfaces ethernet eth0] + description "TEST" [service ssh] + port "8877" [system] - host-name "vyos-suri" + host-name "foo"