Currently, FRR daemons options are hardcoded and cannot be changed in any other way than via direct file edit. However, the ability to control daemons may be useful, for example, to enable/disable plugins, change parameters or behavior.
Would be good to have a CLI section for this.
One can enable snmp module through:
set system frr snmp bgpd set system frr snmp isisd set system frr snmp ldpd set system frr snmp ospf6d set system frr snmp ospfd set system frr snmp ripd set system frr snmp zebra
However all of the above are hardcoded to have the snmp module enabled except for ldpd, found out in https://vyos.dev/T5495