We don't expressly support Micro:bit but in theory it is possible to program it through the Kano Computer Kit. Details regarding how to use Micro:bit can be found on this Raspberry Pi support page and revolves around installing the Mu editor.
To install the Mu editor on Kano OS, go into the Terminal and enter the following:
sudo apt update
sudo apt install mu python3-pgzero
(when prompted for a password, use the default "kano")
Once installed, you'll need to type "mu" into a terminal to get it up and running.