Jenkinsfile scripted inside declarative with foor loop and parallel agent on kubernetes

Jenkinsfile

pipeline {

agent none

options {timeout(time: 300, unit: 'Minutes')}

environment {
  IMAGE = "docker:latest"
  PARALLEL_TEST = "40" // change here how many parallel jobs
  }

    stages{
      stage('script-test') {
        agent none
        options({skipDefaultCheckout true})
        steps {
          script {
            // Variables
            println "Running " + env.PARALLEL_TEST.toString() + " parallel tests"
            def parallelProcesses = env.PARALLEL_TEST.toInteger()
            def tests = [] // empty list
            def jobs = [:] //empty map
            
            for (int i = 1; i <= parallelProcesses; i++) {
              tests.add(i.toString())
            }
            println tests // show all tests

            // building a map
            tests.each { t ->
              jobs["jobs-${t}"] = {
                stage("jobs-${t}") {
                  podTemplate(yaml: """
                    apiVersion: v1
                    kind: Pod
                    spec:
                      containers:
                      - name: jobs-test-${t}
                        image: $IMAGE
                        command: ["tail", "-f", "/dev/null"]
                    """) {
                    node(POD_LABEL) {
                        container("jobs-test-${t}") {
                          sh """
                          echo hello from ${t}
                            """
                        }
                    }
                  }
                }
              }
            }
          parallel jobs
        }
      }
    }
  }
}