How to filter on multiple nested relations?

Help
1

I have a page, which uses a collection named blocks (Many-to-Any). Each of these blocks has multiple translated fields - so another relation called translations.

In my SDK-Api, I want to filter those translations to only return the results in the correct locale.

{
  // page
  id: 2,
  blocks: [
    // blocks collection
    {
      id: 1,
      landing_id: 2,
      collection: "block_hero",
      item: {
        id: 1,
        translations: [
          {
            id: 1,
            block_hero_id: 1,
            languages_code: "de-de",
            title: "German title"
          },
          {
            id: 2,
            block_hero_id: 1,
            languages_code: "en-us",
            title: "English title"
          }
        ]
      }
    }
  ]
}

I already tried this, but it doesn’t work:

{
	deep: {
		blocks: {
			item: {
				translations: {
					_filter: {
						languages_code: {
							_eq: "en-us"
						}
					}
				}
			}
		}
	}
}

All language versions are returned.

How do Filter for page.blocks.item.translations.languages_code === "en-us"?
Thank you!