Get product swap options by variant

curl --request POST \
  --url https://www.myshop.com/apps/memberships/cp/api/product-swaps-by-variant-groups \
  --header 'Content-Type: application/json' \
  --data '
{
  "variantQuantityList": [
    {
      "variantId": 123,
      "quantity": 123,
      "title": "<string>",
      "image": "<string>",
      "productTitle": "<string>",
      "productId": "<string>",
      "sellingPlanId": "<string>"
    }
  ]
}
'

[
  [
    {
      "variantId": 123,
      "quantity": 123,
      "title": "<string>",
      "image": "<string>",
      "productTitle": "<string>",
      "productId": "<string>",
      "sellingPlanId": "<string>"
    }
  ]
]