Have tried to add a Arduino nano 33 ble with nRF52840 to the gateway, with help of the ble, but haven’t succeeded, is there a way to do it?
You would need to write your own add-on for the gateway to do the BLE communication.
An example of an addon using ble is the Ruuvitag adapter
Actually, you should technically be able to connect it using the MySensors adapter. MySensors supports Nordic’s own NRF24 protocol, which your device supports.
You’d have to use one device as the receiver, and then your other devices will connect to that receiver.
Have a look at Candle too. It builds on MySensors to create a privacy focussed smart home system.