curl -k -X POST -Fkey=baz -Fdata='{"op": "exists", "path": ["service","no","such","subpath"]}' https://192.168.122.238/retrieve|jq 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   340  100    47  100   293    547   3414 --:--:-- --:--:-- --:--:--  4000
{
  "success": true,
  "data": false,
  "error": null
}

# Synchronizer settings
Sync {
    Mode FTFW {
        DisableExternalCache on
    }
    Multicast {
        IPv4_address 225.0.0.50
        Group 3780
        IPv4_interface 192.168.15.3
        Interface bond0.110
        SndSocketBuffer 104857600
        RcvSocketBuffer 104857600
        Checksum on
    }
}
Helper {
    Type rpc inet tcp {
        QueueNum 3
        Policy rpc {
            ExpectMax 1
            ExpectTimeout 300
        }
    }
    Type rpc inet udp {
        QueueNum 4
        Policy rpc {
            ExpectMax 1
            ExpectTimeout 300
        }
    }
    Type tns inet tcp {
        QueueNum 5
        Policy tns {
            ExpectMax 1
            ExpectTimeout 300
        }
    }
}

set service config-sync mode 'load'
set service config-sync secondary address '192.0.2.1'
set service config-sync secondary key 'xxx'
set service config-sync section firewall
set service config-sync section interfaces pseudo-ethernet
set service config-sync section interfaces virtual-ethernet
set service config-sync section nat
set service config-sync section nat66
set service config-sync section protocols static
set service config-sync section pki
set service config-sync section vrf

vyos@r4# set nat source rule 100 outbound-interface name 'eth0'
[edit]
vyos@r4# set nat source rule 100 source address '10.0.0.0/24'
[edit]
vyos@r4# set nat source rule 100 translation address 'masquerade'
[edit]
vyos@r4# commit
INFO:vyos_config_sync:Config synchronization: Mode=load, Secondary=192.0.2.1
[edit]
vyos@r4#

set policy local-route rule 10 destination
Possible completions:
+  address              IPv4 address or prefix
   port                 Port number used by connection

vyos@r4# rollback 
Possible completions:
  <N>	Rollback to revision N (currently requires reboot)