COALESCE to json array not working in sql function

 const productItemsImagesSQLAgg = sql<ProductItemImages[]>`
    COALESCE(
      JSON_AGG(
        JSON_BUILD_OBJECT(
          'url', ${images.url}, 
          'key', ${images.key}
        )
      ) FILTER (WHERE ${images.id} IS NOT NULL), 
    '[]'::JSON
    )
    `.as('images');