Brown-out reset in nrf54l15

How can I differentiate between a brown-out and an initial power-up on the nRF54L15?
In my project, I need to detect a brown-out event in order to trigger specific actions. However, it seems that a brown-out reset is similar to a power-up reset.
Additionally, the nrf_reset_resetreas_get() API from nrf_reset.h states:
If none of the reset sources is flagged, the chip was reset from the on-chip reset generator. This indicates a power-on reset or a brown-out reset.

Thanks !

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