I came across this feature and try to assume how can we do the same thing.
Not Tested !!!
-> You can connect your Bluetooth device to your laptop/tablet.
-> Assign static IP to connected device (so now it is in your network).
-> Now set this IP in your POS, and when you click on print it will print via connected device.
(for now you can set printer to your kitchen printer, and from pos screen once you add products to your cart click on 'Orders' button)
Note : If someone test and if success either with above steps or your own please comment on this blog. This may helpful to lots of friends.