I have to share the D+ and D- pins with a battery charger BQ25895.
For this, according to TI, it is prefered to set D+ and D- of the system microcontroller (an arduino nano 33 BLE in this case) to high impedance the first second when a usb plug is inserted. This should guarantee, that the charger can have a proper "look", what kind of USB source is connected (SDP, CDP, DCP,...).
So is there a possibility to access the two pins USB_DM and USB_DP on the NINA-B3X by software and start the communication with the arduino first one second after power up?