I believe I've seen many places post examples of magic mirrors.
Back a few years ago.... people would place a monitor behind a 2-way mirror. Then hard wire a PC (generally concealed in a nearby closet/basement/attic) and a microphone. The PC would use a speech to text software....
you get the idea.
A tiny Raspberry Pi would be easier than an old fashion PC tower.
But a small Amazon-Fire TV (running Alexa) taped behind the mirror..... and DONE. Easy peasy.
Back in the old days (LOL).... we used to dream (fantasize) about things like touch-screen controls at doorways (for automation control) when we'd enter a room. Remember... everything (in the automation world) used to be "push button", a timer, or occasionally a motion sensor.
It's hard to give up on those old ideas. I built a
HAL9000 panel not that long ago. I even experimented... and considered wiring it up... to work with a CM15A equipped PC. Then I thought about mounting an Echo inside it. In the end.... I hung it on my (Man-Cave) wall to just enjoy as a prop.