i would need some help for my node-red code,

i am curently using the “mqtt-out” to connect to a mqtt broker

for the moment, i have put my variable in the server and port : ${BROKER_MQTT_HOST} and ${BROKER_MQTT_PORT}

but , i can’t pass them for the username and password , if you have any idea it would be great

here is my node :

[
{
“id”: “fbd24183c1d90d26”,
“type”: “mqtt out”,
“z”: “6612f3330cf9f37d”,
“name”: “Broker MQTT”,
“topic”: “${BROKER_MQTT_TOPIC}”,
“qos”: “”,
“retain”: “”,
“respTopic”: “”,
“contentType”: “”,
“userProps”: “”,
“correl”: “”,
“expiry”: “”,
“broker”: “6706370c3a497665”,
“x”: 820,
“y”: 580,
“wires”: []
},
{
“id”: “6706370c3a497665”,
“type”: “mqtt-broker”,
“name”: “”,
“broker”: “${BROKER_MQTT_HOST}”,
“port”: “${BROKER_MQTT_PORT}”,
“clientid”: “”,
“autoConnect”: true,
“usetls”: false,
“protocolVersion”: “4”,
“keepalive”: “60”,
“cleansession”: true,
“birthTopic”: “”,
“birthQos”: “0”,
“birthPayload”: “”,
“birthMsg”: {},
“closeTopic”: “”,
“closeQos”: “0”,
“closePayload”: “”,
“closeMsg”: {},
“willTopic”: “”,
“willQos”: “0”,
“willPayload”: “”,
“willMsg”: {},
“userProps”: “”,
“sessionExpiry”: “”,
“credentials”: {
“user”: “”,
“password”: “”
}
}
]