I just made an overview of the assignment of the internal I2C addresses to the sensors and would like to share it here:
Sensor | I2C address
-------------------------------------------------------
BMI270 (6-axis IMU) | 0x68
BMM150 (3-axis MAGNETOMETER) | 0x10
HS3003 (TEMPERATURE, relHUMIDITY) | 0x44
LPS22HB (TEMPERATURE, PRESSURE) | 0X5C
APDS9960 (PROXIMITY, LIGHT, RGB, GESTURE) | 0x39
MP34DT06 (MICROPHONE) | ----