You can also do this using BLE (Bluetooth Low Energy), but don´t expect it to be easy. If you want to take a look --> https://www.arduino.cc/en/Reference/ArduinoBLE
Also you might have in mind that distance between the boards might be an issue. Using NRF24L01 you will have some hundred meters of range. BLE is for < 70 m and this distance can be much less indoors to be effective.
Last, but not least, HC-05 modules doesn´t support BLE. You´ll need HC-09 modules.