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I was wondering if someone has done something similar:
(social.graves.cl)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
If it's a gas burner then it produces CO2 as it operates, right? You could probably mount an ESP32 kit with a CO2 sensor (SGP30) and passive infrared receiver (AM312) over the range to monitor the CO2 level, and also whether anyone is standing at the stove. I didn't check to see whether these modules were supported directly by esphome, but I'm sure the project either has a compatible module, or you could adapt something from the project to support these modules.
You could then program HA to alert if long term CO2 is elevated and no motion is detected at the range for some time.
Just an idea. I might try tinkering with something similar this weekend. I don't have the gas sensor, but I've been looking for an excuse to order one