TPS54331: to ensure 2.1V for BOOT-PH voltage

Part Number:TPS54331

Hi Team,

Is it possible to apply external voltage (VOUT+2.5V etc.) to BOOT pin to ensure 2.1V for BOOT-PH voltage?

The background of the question is my customer's system requirement is the following and 2.1V(TYP) of BOOT-PH voltage couldn't be ensured in this case.
*Vin=4.2V, Vout=3.3V / Iout=2.5A (MAX)



Best Regards,
Yaita / Japan disty