Anyone know of a smart LPG valve to a BBQ?

Does anyone know of a LPG valve that you can control the flow to a BBQ.
I couldn’t find anything when I searched, perhaps my search term is wrong?

They are often called “modulating valves” and are normally expensive and hard to obtain as electronics and gas don’t mix well.
https://www.supplyhouse.com/Maxitrol-M520H-3-4-3-4-Modulating-Valve-for-use-with-LPG-liquid-propane-gas

Not sure this is what I actually want, I googled for more variants of these and it seems they are either on or off.
There isn’t a lot of info on that page.
I wanted to be able to regulate the flow so that I can set up a generic thermostat and control the LPG flow to hold a temperature in the BBQ and that means it has to always flow some gas it can’t be on/off.