Can you please share more details how this can be done. The app should be written in Python running on a Linux pc to which the nrf52840 dongle is connected. The dongle role is hogp peripheral. The Python app should be able to start hogp kb or mouse advertising.
I don't have much specific advice, other than looking at the pc-ble-driver-py examples to see how it can be used. Then you can probably look at the HID implementations in the normal nRF5 SDK (in C), since they essentially use the same SoftDevice API as the pc-ble-driver-py.
