REST API product image

Hi there,

I am using the REST API to WooCommerce to create simple and variable products.
Now I’m stuck at a problem with prouct images. The referenced images are already uploaded to WordPress.
Within the POST to create a product there is

...
"images": [
        {
            "src": "https://www...jpg"
        }
    ],
...

The product is created but the image is connected with the product as a product gallery image. I need the images a product image! Instead my shop isn’t working because the gallery images arn’t used.
When I change the image association to the product as I want it as the one product image all works in the shop and I mentioned a strange behaviour.
When I get this product via the REST API there is no difference in the JSON response for the image associated as product gallery image or as product image.
Is there a way to control the usage of the image or explicitliy add the image as product image?
Thanks for you help.

Klaus