Overriding the default value of childNodes

Community Newcomer's Corner
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And again this same problem happens when I try to extend the TwoColumn NodeType like this:

'Vendor.Site:TwoColumn':
  superTypes:
    'Neos.NodeTypes:TwoColumn': TRUE
  properties:
    layout:
      defaultValue: '26-34'
      ui:
        reloadIfChanged: TRUE
        inspector:
          editorOptions:
            values:
              parentNode: [ ]
              '26-34':
                label: '43% / 57%'
              '34-26':
                label: '57% / 43%'

'Neos.NodeTypes:Page':
  childNodes:
    'main':
      constraints:
        nodeTypes:
          '*': FALSE
          'Vendor.Site:TwoColumn': TRUE

I added parentNode: [ ] like the documentation suggests and this just results in an extra empty option in the select box. I also tried replacing parentNode with ‘Neos.NodeTypes:TwoColumn’ without success. I’m sure this is doable through the configuration, the documentation says it, maybe the syntax changed ?