There's no way to directly import information into a metadata preset. However, there may be an easier way to accomplish your task. Upload a sample XMP file you've received to Dropbox (or similar) and post the sharing link here. With that, we can probably suggest an easier method.
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You have to apply the xmp template to an image in either Bridge (best) or Photoshop, or maybe in PhotoMechanic. Then get the image into Lightroom and then save a metadata preset or just sync that image's metadata to the other images.
I have some clients who send me captions for the events in xmp format.
If they are indeed just sending you captions, then an easy method is:
1. Edit the XMP file in a text editor, e.g. Notepad on Windows or TextEdit on Mac.
2. Copy the caption.
3. In LR, select all the photos to which the caption should be applied.
4. In the Metadata panel on the right of Library, paste the caption from step 2 into the Caption field.
Only if there is more than one field that needs to be set for each photo (e.g. Title, Caption, and Job Identifier) would it be profitable to apply the XMP template in Bridge or PS and then import the image into LR. Posting a sample XMP file would make it clear which field(s) are being set.