IMatch can import
face regions written by other XMP-compliant applications. See
Using Google Picasa™ / Adobe Lightroom® Face Tags in IMatch for more information.
So, if your other application stores the information in the standard XMP face region format, the answer is yes.
The
PersonInImage tag is a standard tag and
should contain the 'names' (or similar attribute) of all the persons in the image.
See
Faces and XMP Metadata in the IMatch help for more information.
Mylio seems to have only rather limited support for XMP (as far as I could figure out in a limited test by installing a demo a while ago and writing some metadata to see what the results are).
PersonsInImage is not maintained by them, among many other useful or even required fields. It also does seems to not import/map existing EXIF/legacy IPTC or all relevant GPS fields into the XMP record it maintains internally and thus the XMP record they produce is very
'basic'.
Metadata handling is probably not something Mylio prioritizes - like so many other consumer products out there.