Voice assistant triggered Wake-up Automation at specific time

Hi, I am new to HA and have looked for a solution to my problem but haven’t been able to find one.
Is it possible to run a “Wakeup Automation” at a specific time that would be activated by a voice command like, “Wake me up at 7:00”.
I primarily use Siri and would like to use it for this as well, but if that isn’t possible, then I do also have a google assistant and an echo.

Any help would be great!

Thanks in advance.