I have a use case where I would like to create a DynamicReferenceParameter that based on a suite chosen in a dropdown creates inputs for all of the known parameters in that suite and then passes it down to the pipeline.  I believe this could be converted into a JSON string of some sort and passed in that way.  Right now, ET_FORMATTED_HTML only passes for one input element.  

I have this form working, but setting the inputs doesn't do anything as expected.

 [
                        $class: 'DynamicReferenceParameter',
                        description: 'All parameters shown are needed for the chosen playbook.',
                        name: 'Parameters',
                        referencedParameters:'playbook',
                        choiceType: "ET_FORMATTED_HTML",
                        script: [
                                $class: 'GroovyScript',
                                script: [
                                        sandbox: false,
                                        script: """
import org.yaml.snakeyaml.Yaml
def file = new File("/var/lib/jenkins/userContent/${jenkins.env.JOB_BASE_NAME}-manifest.yaml")
def input = new Yaml().load(file.text)
def selectedPlaybook = playbook
def inputs = ""
input[selectedPlaybook]["variables"].each{ param ->
    inputs += \"\"\"
        <div name="parameter" class="jenkins-form-item">
            <div class="jenkins-form-label">
                <label class="jenkins-label" for=\$param>\${param}:</label>
            </div>
            <div class="jenkins-form-control">
                <input name=\$param id=\$param class="jenkins-input">
            </div>
        </div>
    \"\"\"
}

def html = \"\"\"
        <div class="jenkins-form-item tr">
        <div class="jenkins-form-label"></div>
            <div class="jenkins-form-control">
                <div id="parameter-container">
                    \${inputs}
                </div>
        </div>
        </div>
        \"\"\"
return html
                            """
                                ]
                        ]
                ]