How to split routes to separate files for Rails App or Rails Engine

routes.rb

# config/routes.rb

# frozen_string_literal: true

MyApplication::Application.routes.draw do
  draw_routes_for :v1
  draw_routes_for :v2
  draw_routes_for :v3
  
  root to: 'projects#index'
end

routing_draw.rb

# config/initializers/routing_draw.rb

# frozen_string_literal: true

module ActionDispatch
  module Routing
    class Mapper
      def draw_routes_for(routes_name)
        instance_eval(File.read(Rails.root.join("engines/my_application/config/routes/#{api_version}.rb")))
      end
    end
  end
end

v3.rb

# config/routes/v3.rb

# frozen_string_literal: true

Rails.application.routes.draw do
  scope :v3, module: :v3 do
    get   '/profile/me',      to: 'profiles#me'
    
    post  '/login',           to: 'sessions#create'
    post  '/logout',          to: 'sessions#destroy'
  end
end