Where query that filters out relationships that have count of 0

[robbertstevens]

const Product: CollectionConfig = {
  slug: 'product',
  fields: [
    {
      name: 'title',
      type: 'text',
      required: true,
    },
  ],
}

const Category: CollectionConfig = {
  slug: 'A',
  fields: [
    {
      name: 'title',
      type: 'text',
      required: true,
    },
    {
      name: 'products',
      type: 'relationship',
      relationTo: 'product',
      hasMany: true,
    },
  ],
}

If I have these 2 collections. How would I select all the collections that do not have any products attached to them?

I've tried to do a where query like this, but that doesn't work.

{
    products: {
        exists: false
    }
}