I found that, in sources
https://github.com/m5stack/M5Stack_MicroPython/blob/master/MicroPython_BUILD/components/micropython/esp32/modules/m5flow/units.py
There is ENV sensor object. But it does not work, because there is no dht12 and bmp280 modules.
I am not sure if developers test their devices on micropython.
May be, it will be better to use base micropython and add m5 drivers?
This library worked for me
https://github.com/dafvid/micropython-bmp280
addr=0x76