Hello, Marta,
Thank you for getting in touch with us.
Sorry, but there is no such possibility. You can select an Image type for variations and upload dual colors as images only.
You can maybe find an additional plugin that provides the desired functionality, then our variation swathers can be disabled via Theme Options, but we can’t guarantee compatibility with 3rd party plugins, and we do not provide support for them.
We hope for your understanding.
Kind Regards,
8theme team