It isn’t, but you’re currently unable to create a new topic there because of your Trust Level as a new user, which is described in How to Use the Wishlist. Even if you did try to create a new Wishlist topic with this request, a Moderator would very likely merge it into the other topic that I linked above, and which I see that you’ve now voted for, so thank you for that! 
I understand what you mean about not wanting to download another app, too. My suggestion about Alexa was to make you aware of that as a possible option in case it’s something you’re already using. If you’re not an Alexa user, then I wouldn’t rush out to buy a particular Echo device just to get a thermometer. There are other solutions for that, as @K6CCC mentioned.
I don’t know if you use any Wyze cameras, but some Cam users have been requesting this in the Wishlist for a while: