Person Shown tag

[SportPhoto24]

Hello i just started using you program i would like to know if it is 
possible to write the tag person shown EXIFTOOL TAG ([XMP-iptcExt]   
PersonInImage : ) when face is detected as now i see that it is writing 
tag to ([XMP-MP] RegionPersonDisplayName :) i did a script in exiftool 
but it takes a long time to wright manualy exiftool 
-"XMP-mwg-rs:RegionName>XMP-iptcExt:PersonInImage"  can you let me know 
if there is a way to do it directly with the software?
Thank You
Franco