lubuntu – how to send a whatsapp message to unregistred numbers via whatsdesk or any desktop program linux?

When I used WhatsApp desktop in Windows, I used whatsapp://send?phone=[phone] to begin a new chat with an unregistered phone. I would like to do something similar in Linux.
I can open Whatsdesk with the link whatsapp://app but when I use whatsapp://send?phone=[phone], it doesn’t begin a new chat, this only opens the app