Updating product variant using catalog V1

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Question:
There is no way to update the product variant using catalog v1 REST API. If I create a product by passing variants

POST https://www.wixapis.com/stores/v1/products

"variants": [{
    "choices": {
        "color": "black"
    },
    "price": 39.0,
    "sku": "SN-CB"
  }
]

it creates a product, but variant does not include the SKU (value is empty, price and choices are set correctly). When I try to update the product variant, it does nothing

PATCH https://www.wixapis.com/stores/v1/products/{created_id}

{
"products": {
    "variants": [{
          "id": "a0b26abb-1262-4103-bcff-3b6d076b4d51",
          "choices": {
              "color": "black"
           },
           "sku": "SN-SB",
           "price": 40
     }]
}
}

nothing changes. Even lastUpdated property of the product stays the same. How to correctly update the variant values?