In a declarative jenkins pipeline - can I set the agent label dynamically?

Question

Is there a way to set the agent label dynamically and not as plain string?

The job has 2 stages:

1. First stage - Runs on a \"master\" agent, always. At t

Answer 1

it might be something about the context of the script block.

this works, using a label of 'docker' in second stage:

def hotLabel = 'docker'

pipeline {
    agent { label 'master' }
    stages {
        stage('Stage1') {
            steps {
                echo "node_name: ${hotLabel}"
            }
        }

        stage('Stage2') {
            agent { label "${hotLabel}" }
            steps {
                echo "node_name: ${hotLabel}"
            }
        }
    }
}

this does not (gets the same There are no nodes with the label ‘null’ error):

def hotLabel = null

pipeline {
    agent { label 'master' }
    stages {
        stage('Stage1') {
            steps {
                script {
                    hotLabel = "docker"
                }
            }
        }

        stage('Stage2') {
            agent { label "${hotLabel}" }
            steps {
                echo "node_name: ${hotLabel}"
            }
        }
    }
}