Control multiple Cover/Rollershutter via Alexa with One Command?

Im quite new to HA and doing pretty well so far. I use the Service from Nabu Casa which makes things really easy for me. The only Problem i have - i cant control multiple covers with 1 command.
What i want to achieve:
Command : "Alexa, living room up (actually im from Germany so the command will be Alexa, fahre die Rollos im Wohnzimmer hoch). In the living room i have 3 covers and i cant get this done. Controlling everyone for itself is no problem…

my first aproach was to create a group within alexa - but this didnt work ou. I thought maybe i can create a "Helper cover" inside Home Assistant - but i dont know how to do this. I actually created only some “switch” helper - which can be on/off - but this is a way i don`t want to talk to Alexa.

Can someone pls help me out ? Is there a way to create a “cover-helper” and expose this to Alexa - or is there maybe another way to get this done ?

Any help is really appreciated

You can create an input_boolean and then build an automation to put the covers up when the state of the input boolean changes to on. Then expose this input boolean to alexa. In alexa after discovering and adding this input_boolean, create a routine with the voice command you wish for and put the action as switch on this input_boolean.

If you want to close the cover you can create the automation to activate when the input boolean changes to off and create a routine like wise.
There could be other methods also but this will work for sure.