FireStick Volume

I have several FireSticks that turn on at a specified time. These FireSticks display various content on different multiple TVs. I need to specify the startup volume in case someone has previously changed the volume. Can anybody explain to me how I can set the volume of the FireSticks via HA?

Not sure, but as its a media_player, take a look here:

Firestickā€™s have no volume control. It would be nice, butā€¦ nope.