For my own morbid curiosity, why Zigbee?
If you don’t want to learn ESP Home yet, but you’re ok with Wifi, here’s a sensor that uses ESPHome, but is all pre-programmed and ready to go with Home Assistant. I haven’t used this produce yet, but the other products from Apollo are pretty awesome.
https://apolloautomation.com/products/temp-1-temperature-probe-for-home-assistant
Similar idea, but a different service if you like gotify: https://github.com/tystuyfzand/gotify-smtp