MQ2 Sensor, ADS1115 & Node-Red

I would like to connect an MQ2 smoke/LPG/CO sensor to NodeRed and output its readings.

I have the sensor, connected successfully to a Raspberry Pi via an ADS1115 ADC, which produces analogue readings which fluctuate significantly.

The sensor needs calibrating, with formulas to output the various readings. Does anyone know how to do this with Node-Red? I can't see references anywhere.

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