How to call closure from Kotlin DSL

Help/Discuss
1

I have a Gradle plugin in Groovy which has a setter method

void setDynamicTokens(Map<String, ?> dynamicTokens) {
	this.dynamicTokens = dynamicTokens
			.collectEntries { k, v ->
				[(k): [refId: { v.refId }, defaultValue: { v.defaultValue }, transform: {
							v.transform ?: {
								it
							}
						}]]
			}
			.collectEntries { k, v ->
				[(k): v as DynamicToken]
			} as Map<String, DynamicToken>
}

and Dynamic Token is an interface

interface DynamicToken {
	String refId()

	String defaultValue()

	Closure<?> transform()
}

in build.gradle we used to set something like this

dynamicTokens = [
		deployName             : [refId: "deploy.name", defaultValue: project.name.toLowerCase().replaceAll("[-]", ""), transform: {
				it.length() > 20 ? it.substring(0, 20) : it
			}],
		jvmAllowedMemory       : [refId: "jvm.allowed.memory", defaultValue: "1024m"],
		jvmActiveProcessors    : [refId: "jvm.active.processors", defaultValue: "2"],
		autoscaleMinReplicasCentral   : [refId: "autoscale.minReplicas.central", defaultValue: "1"],
		deploymentStrategy   : [refId: "deployment.strategy", defaultValue: "canary"],
		resourcesCpuMillicores : [refId: "resources.cpu.millicores", defaultValue: "2000"],
		resourcesCpu           : [refId: "resources.cpu.millicores", defaultValue: "2000", transform: { "${it}m".toString() }],
		resourcesMemoryMi      : [refId: "resources.memory", defaultValue: "2048"],
		resourcesMemory        : [refId: "resources.memory", defaultValue: "2048", transform: { "${it}Mi".toString() }],
	]

however I am not sure how to call closure from build.gradle.kts. I am trying to do something similar but of no use

project.extensions.getByType(com.tgt.search.deploy.prepare.plugin.PluginExtension::class.java).apply {
      
        setDynamicTokens(
            mapOf<String,DynamicToken>(
                "deployName" to object:DynamicToken{
                    override fun transform()=KotlinClosure1<String, String>({
                        if (this.length > 20) this.substring(0, 20) else this
                    })

                    override fun defaultValue()=project.name.toLowerCase()
                    override fun refId()="deploy.name"
                }