Kotlin issues (companion object)

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 8.6.5
• Cross-platform modules: 8.6.2
• Android Runtime: 8.6.1 (also 8.7.0-alpha.1)
• iOS Runtime (if applicable): -
• Plugin(s): -

Describe the bug
I tried to do some basic stuff with Kotlin stuff inside a NativeScript app (as I have no experience with Kotlin development) and I am experiencing some issues with companion objects.

I added this Kotlin file to App_Resources/Android/src/main/java

// KotlinTest.kt
package com.example

class KotlinTest {
    val hello = "Hello from Kotlin!"    //working

    @JvmField
    val instanceTestField : Int = 1234  //working

    companion object {
        @JvmStatic
        fun increment(num: Int): Int {  //working
            return num + 1
        }

        @JvmField
        val message : String = "Hi!"    //not working

        const val VERSION = 9           //not working
    }
}

And I am trying to access the values like this in the NativeScript app:

const testObject = new com.example.KotlinTest();

console.log(testObject.hello);                    //working
console.log(testObject.instanceTestField);        //working
console.log(com.example.KotlinTest.increment(5)); //working

console.log(com.example.KotlinTest.message);      //not working
console.log(com.example.KotlinTest.VERSION);      //not working

As far as I can read here about @JvmField annotation and here about const modifier this is valid Kotlin so it also shold work in NativeScript, but I always get undefined for those elements.

To Reproduce
Start the demo app provided below and check the logs in console.

Expected behavior
JvmFields and const values inside companion objects should be accessible in NativeScript.

Sample project
ns-android-kotlin.zip

Additional context

App_Resources/Android/src/main/java にある Kotlin の例と、リンクされている ns-android-kotlin.zip サンプルプロジェクトから始めます。デモアプリを実行し、companion-object のフィールドについてコンソール出力を確認し、動作するフィールドおよびメソッドと比較します。@JvmField と const の値に NativeScript から期待どおりアクセスできれば完了です。