Welcome @gj, to the community!
The VNF1048F is not a high-side switch, but a high-side switch controller, where there is no K factor in the sense. Instead, measurements are taken via a shunt and the voltage dropping there is measured with a 10-bit ADC in a voltage range of 0...160mV (data sheet, section 3 and table 13 or table 45).
Does it answer your question?
Regards
/Peter
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