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Mylio also does XMP-stored face tags. It can interchange them with Lightroom. IIRC it can't move the frames around, but that may have changed. Check out their demo for details. Mylio syncs across a variety of devices.
I created a project recently that does exactly this, traverse your Google Photos and outputs a map (kml file). https://bitbucket.org/blackey02/city-log
Because darktable stores this info in its own database on initial import, you will have to force it to re-read the info from the altered files. The sure-fire way to do this is to remove the files within darktable and re-import them. In the case where you have image edits that you don't want to lose, you'll need to create .xmp sidecar files for the image ...
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