How to add common header in Rails with Grape?

Is there any way that I can common header in Rails with Grape so I do not have to specify the same header over and over again?

namespace :user do
  desc 'Return a user.', {
    headers: {
      "Authorization" => {
        description: "Some Token",
        required: true
      }
    }
  }
  get do
    {}
  end
end

Notice that headers would have to be specified over and over in all my APIs since I want them to be secure. Is there a shortcut way (a design pattern) that I can follow without creating this header everytime?

And no I am not looking for something like this:

def headers { "Authorization" => { description: "Some Token", required: true } } end

namespace :user do desc 'Return a user.', { headers: headers } get do {} end end