Custom Editor component, required field

I’m trying to extend the default image widget by creating a custom markdown component. The problem I’m having is that I can’t get any of the fields to be required.

  id: 'image',
  label: 'Image',
  fields: [
    { name: 'image', label: 'Image', widget: 'image' },
    { name: 'link', label: 'Link', widget: 'string' },
    { name: 'alt', label: 'Alt Text', widget: 'string' },
    { name: 'title', label: 'Title', widget: 'string' },
      name: 'height',
      label: 'Height (number of pixels 0-2000)',
      widget: 'string',

I thought you could pass required: true to field options but sadly it doesn’t work. At the moment you can publish the page with all the fields being empty.

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