This is not provided or possible.

I know that may sound absolutely terrifying to a Pi or Arduino user but... maybe just using a LDR and maybeee a resistor (playing with the resistance values) to mimic a 10k thermistor, and plugging that to a temperature sensor input of whatever controller you use may be enough?

All controllers have what's basically a resistance meter that can vary any parameter of the lighting. What you want to do with a Pi could very well be achieved with discrete components.

I have a couple of light sensitive resistors from an arduino kit, and in ambient light their resistance vary between 10 and 3kOhms when i place my hand over it. that's not far from what a 10k NTC does with temperature.
And no code needed, Aquasuite can vary effect brightness with a sensor input.