Can't query relationship in Block

We're trying to use blocks to apply filter config to collection items.

I have a block defined like so:

const CategoryFilterBlock: Block = {
  slug: "CategoryFilter",
  fields: [
    {
      name: "categoryFilterType",
      label: "Type",
      type: "radio",
      options: ["whitelist", "blacklist"],
      defaultValue: "whitelist",
    },
    {
      name: "categories",
      type: "relationship",
      relationTo: Categories.slug,
      hasMany: true,
    },
  ],
};

Which is used on the collection like so:

{
  <collection_config>,
  {
    name: "filters",
    type: "blocks",
    blocks: [CategoryFilterBlock],
  }
}

I can query the

field and the

field, but I can't query for a value in the relationship:

// Works
{
  "filters.blockType": {
    equals: "CategoryFilter"
  }
}

// Also works
{
  "filters.categoryFilterType": {
    equals: "whitelist"
  }
}

// Doesnt work
{
  "filters.categories.label": {
    equals: "Some category label"
  }
}

Is this a bug or is this just outright not possible?