Show a Shelly 1 as a button in echo hub

Hi, i’ve a garage door controlled by a shelly 1 by a dry contact, it runs step by step (open-stop-close-stop) and the shelly is set with auto turn off after one second to emulate a button. I expose the shelly to alexa via shelly skill but it is shown as a plug.
How can i do to create a button in home assitant to control the shelly and expose it in alexa by haaska skill?