Calibrate chamber temperature sensor?

I would guess no. At least not officially or directly.
Marlin entails specific codes for the purpose, but I am not sure if the BL printer will accept them, and even if true, I doubt it would be possible to save them to the EEPROM.

You are likely correct, as they are thermistors and operate under a wide range of temperatures.

You can always add a temperature sensor, yet to see the value simultaneously with other probes, you need to use third-party software.

Alternative: If your case is critical, you can cheat the system. Instead of calibrating, you set the temperatures in the software to improve accuracy. It would be best to have a reference standard sensor, which must be accurate within the complete temperature range and some data logger or display. You can find more straightforward solutions at Temperature calibration.

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