How to use build parameters in the pieline.agent.node block of a Jenkinsfile?

I'm developing a Jenkins pipeline for a PHP project. Since I want to run the most of the steps from the project's root directory, I set the customWorkspace:

pipeline {
    agent {
        node {
            label 'devvm-slave-01'
            customWorkspace '/path/to/my/project'
        }
    }
    stages {
        stage('build') {
            steps {
                sh 'pwd'
                ...
            }
        }
    }
}

It's working fine, but I don't like, that the path is hard-coded in the Jenkinsfile.

So I tried to solve this by using parameters:

The problem is: I haven't found a way to access parameters in the block pipeline.agent.node. I can read and handle them in the pipeline.stages.stage.steps sections. But not in the node block.

Is it possible / How to access Jenkins project parameters in the node section of the Jenkinsfile?

You can pass the parameter instead of hard-coded value for customWorkspace like this:

pipeline {
    agent {
        node {
            label 'devvm-slave-01'
            customWorkspace PROJECT_ROOT
        }
    }
    stages {
        stage('build') {
            steps {
                sh 'pwd'
                ...
            }
        }
    }
}