What is the correct way to use select2 tagbox in reactjs application to allow user input for choice items?

[kalpadiptyaroy]

What I have tried?

1. I have went through this issue: tagbox not allow to add new tag #5689
2. I have went through this plunkr: https://plnkr.co/edit/zX0JXRRHOozBhBCg?preview

What is not working for me?

I have added a question like this, but this is not getting rendered as select2 tagbox in React!

{
        "type": "tagbox",
        "renderAs": "select2",
        "allowAddNewTag": "true",
        "choices": ["one"],
        "name": "countries",
        "title": "Please select the country you have arrived from:"
}

Actual Output:

Expected Output:

Is there something I am missing?
Is there something that needs to be added in app.js file?

if yes, Please guide me.

Thanks,