pass the content in campaign

[narender2031]

template code:

<div class="article" mc:repeatable="">
  <h3 mc:edit="article_title">Title</h3>

  <p mc:edit="article_content">Content</p>
</div>

I want to know how can I change Title and content from the following api.

body = {
      template: {
        id: 354533,
        sections: {
          article_title: 'hello',
	  article_content: 'Articale to success for mission!'
        }
      }
    }
}

result = Gibbon::Request.campaigns(campaign_id).content.upsert(body: body)

I want to update my template content for a template. But I don't know how to pass the variables.
can you please give a example.