Nginx – N8N does not detect ip in environment variable with Jelastic JPS

I am trying to implement n8n with a JPS manifest, but I have the problem that Jelastic does not detect the DB_POSTGRESDB_HOST environment variable and I need to pass the ip of the postgres node to that variable with ${nodes.sqldb[0].address } It only works when I have manually implemented and added that variable and its value from the graphical interface but I have not been able to pass that variable to it from the JPS, not even by writing a random IP to see if it detects it.
Does anybody know what is it due to?
Thank you so much.

type: install
id: n8n-workflow
version: 1.0
name: n8n Workflow Automation
homepage: https://n8n.io/
logo: https://asset.brandfetch.io/idO6_6uqJ9/id-H5HD3pX.png?updated=1655217178680
globals:
  db_user: n8n-${fn.random(1000)}
  db_pswd: ${fn.password}
  encryption_key: n8n${fn.password}
targetRegions:
  type: [ vz.*, pcs.* ]
categories:
  - apps/automation
  - apps/popular

onBeforeInit: |
  import org.apache.commons.httpclient.HttpClient;
  import org.apache.commons.httpclient.methods.GetMethod;

  var client = new HttpClient(),
      getMethod,
      response,
      status,
      resp,
      url;
  
  url = "https://registry.hub.docker.com/v2/repositories/n8nio/n8n/tags";
  getMethod = new GetMethod(url);
  status = client.executeMethod(getMethod);
  resp = getMethod.getResponseBodyAsString();
  resp = JSON.parse(resp);
  tags = resp.results;

  var ver = {};
  var def = "latest";
  var tag;

  for (var i = 0, n = tags.length; i < n; i++) {
      tag = tags[i].name;
      if (tag) {
          ver[tag] = tag;
          def = tag;
      }
  }

  return {
      result: 0,
      settings: {
          fields: [{
              name: "version",
              caption: "n8n Version",
              type: "list",
              values: ver,
              "default": def
          }]
      }
  };

ssl: true

nodes:
- nodeType: nginx
  displayName: Load Balancer
  cloudlets: 16
  nodeGroup: bl
- image: n8nio/n8n:${settings.version}
  displayName: n8n
  cloudlets: 16
  nodeGroup: cp
  links: sqldb:db
  startServiceOnCreation: true
  env:
    N8N_BASIC_AUTH_ACTIVE: true
    N8N_BASIC_AUTH_USER: ${globals.db_user}
    N8N_BASIC_AUTH_PASSWORD: ${globals.db_pswd}
    WEBHOOK_TUNNEL_URL: ${env.url}
    N8N_ENCRYPTION_KEY: ${globals.encryption_key}
    DB_TYPE: postgresdb
    DB_POSTGRESDB_DATABASE: n8n
    DB_POSTGRESDB_HOST: ${nodes.sqldb[0].address}
    DB_POSTGRESDB_PORT: 5432
    DB_POSTGRESDB_USER: ${globals.db_user}
    DB_POSTGRESDB_PASSWORD: ${globals.db_pswd}
- image: postgres:16.2
  cloudlets: 16
  nodeGroup: sqldb
  displayName: PostgreSQL DB
  env:
    POSTGRES_USER: ${globals.db_user}
    POSTGRES_PASSWORD: ${globals.db_pswd}
    POSTGRES_DB: n8n

onInstall:
  - if ('${env.protocol}' == 'https'):
      cmd[bl]: |-
        CONF_FILE="/etc/nginx/nginx-jelastic.conf"
        sed -i ':a;$!{N;ba};s/\(location \/ {\)/\1\n\n\t\t\t\t\t\tif ($http_x_forwarded_proto = http) {\n\t\t\t\t\t\t\t\treturn 302 https:\/\/$host$request_uri;\n\t\t\t\t\t\t\t\terror_page  500 502 503 504 = @rescue;\n\t\t\t\t\t\t}\n/1' "$CONF_FILE"
        sed -i -r 's/(:80)$ common;/:5678$ common;/' "$CONF_FILE"
        sed -i -r 's/(server[[:space:]]+[0-9]+.[0-9]+.[0-9]+.[0-9]+)(;)/1:56782/g' "$CONF_FILE"
        sed -i -r 's/(server[[:space:]]+([0-9]+.[0-9]+.[0-9]+.[0-9]+))[[:space:]]*;/1:5678;/' "$CONF_FILE"
        service nginx restart
      user: root
      

success: |-
  n8n Workflow Automation is ready to use. Please open [${env.url}](${env.url}) to configure your workflows.
  
  **Username:** ${globals.db_user}
  **Password:** ${globals.db_pswd}

I tried with these options but the problem is that although the statement obtains the IP, it is not assigned to the environment variable.

DB_POSTGRESDB_HOST: ${nodes.sqldb[0].address}
DB_POSTGRESDB_HOST: ${nodes.sqldb.first.address}
DB_POSTGRESDB_HOST: ${nodes.sqldb.master.address}

The problem is that when the IP is assigned to the variable, the Postgres node has not been created, therefore it does not have an IP, how can I pass that IP to it later?