Having multiple columns in a template

The CMS Questions
1

Hello,
I’m trying to have a page bluprint with multiple columns inside columns.
Is that possible ?
Here is a screenshot of what I would like it to look like!

And here is my blueprint:

title: Project

columns:
  left:
    width: 1/2
    sections:
      Headline:
        type: fields
        fields:
          title:
            type: text
          text:
            type: textarea
          related:
            label: Texte lié
            type: pages
            multiple: false
            query:  site.children.children.listed.template("text")
            text: "{{ page.title }} || {{ page.texte.excerpt(180) }}"
          video:
            label: Video
            type: text
            help: Un format qui doit être sous forme numérique, la valeur après vimeo.com/
            placeholder: " par exemple 376670516"
          color:
            type: color
            editableAlpha: false 
            default: "#FFFFFF"
  right:
    width: 1/2
    sections:
      gallery:
        headline: Images
        type: files
        layout: cards
        size: huge
        text: "{{ file.title }}, {{ file.date }}, {{ file.medium }}, {{ file.hauteur }}× {{file.largeur}}"
        image:
          back: "{{ file.color }}"
2

You don’t need columns, but can set the width of the fields instead.

video:
  label: Video
  type: text
  help: Un format qui doit être sous forme numérique, la valeur après vimeo.com/
  placeholder: " par exemple 376670516"
  width: 2/3
color:
  type: color
  editableAlpha: false 
  default: "#FFFFFF"
  width: 1/3
3

Thanks a lot.
Seems i didn’t read the doc properly…