DONE!

I'm using this code working like a charm :)

Data = JObject.Parse(Convert.ToString(JsonString))

Correction, my JsonString variable is a JObject not a string.

I'm using this in Content :

{{companies}}

The output was this :

[object Object],[object Object]

Bless you. Thank you so much Jan :)
I will try it and give feedback on this.

If I have variable that consist Json string that I got from Json query :

var JsonString;

That JsonString variable consist of this string :

{
  "companies" :
   {
     "name" : "My company",
     "address" : "Mainroad 12"
   }
}

This is my source code :

var report = await rs.RenderAsync(new RenderRequest
            {
                Template = new Template
                {
                    Recipe = Recipe.ChromePdf,
                    Engine = Engine.Handlebars,
                    Content = "{{ }}"
                },
                Data = new { }
            });

My questions, can I use that JsonString variable as datasource?
If it can, how to implementing it and, for example, how to call "name" into Content?

Thanks for your reply.

Okay thank you. I will try to understand more.
Just for your info, I already install jsreport.Client and jsreport.Binary.
But I have error went trying to install jsreport.Embeded.
I'm using .Net Framework 4.6 on my project.

Using VS 2015, jsreport.embeded installed.
Can someone help me with this?
Thanks before.