Header variable

I created a blueprint file named ‘project.yaml’ with the following code:

title: Project
@extends’:
type: default
context: blueprints://pages

form:
fields:
tabs:
type: tabs
active: 1

  fields:
    content:
      fields:

        header.renovation_package:
          ordering@: 6
          style: vertical
          size: small
          type: select
          label: Πακέτο Ανακαίνισης
          description: <small style="color:#cccccc;"><i><strong>NOTE:</strong> Lorem ipsum</i></small>
          options:
                default: -
                superior: 'Superior'
                executive: 'Executive'
                deluxe: 'Deluxe'

…my proble is when i try to output the variables of the ‘select’ fields with twig i get the ‘key’ not the value!!!

Example, if i select the default option:

{{ header.renovation_package }}

…gives…

‘default’

…not…

‘-’

…how do i get the value instead of the key?