how to create a custom json from raw data (database data)

I have create a show method in tour controller and want to render the data from the database into json format. This the definition of the tour controller

class ToursController < ApplicationController

    respond_to :json

        def show    
            @tourcategory = Tourcategory.find(params[:id])
            @tours= @tourcategory.tours
            @tourcategories = Tourcategory.all
            render :layout => false

        end
    end

This is the definition of the show.html.haml view

    %h3 Tour for #{@tourcategory.title}
    = @tours.to_json

The output of this code is following:

[{"content":"dscfds","created_at":"2015-12-12T09:48:32Z","elementid":"test1","id":8,"jobid":2,"next_button_title":"next","priority":23,"title":"test1","updated_at":"2015-12-12T09:48:32Z"}]

But i just want to render the data in this kind of json format, following:

var tour = {
  id: "tour",
  steps: [
    {
      title: "abc",
      content: "Click this  Button.",
      target: "#abc",
      placement: "bottom",
      showNextButton: false,
      skipIfNoElement : true
    },