Counting Bluetooth advertising scan windows

[ogrego]

Hello,
I'm trying to figure out what bluetooth channel is used by the ESP32 for the current advertisement scan (37, 38 or 39).
I couldn't find any API method for it and I couldn't extract any valuable information from the gap callback parameters (esp_gap_ble_cb_event_t , esp_ble_gap_cb_param_t).
Since the esp32 changes the channels for scanning in round robin (as far as I could tell), I'm currently trying to count the scan windows.
Is there any solution for this?