That is an incredibly awesome and thoughtful gift. I'm sure they'll be thrilled to get it!

Buying a braille label writer and a couple rolls of braille labeling tape ($20 and $2.25 each through ecommerce.nfb.org and available many other places) might be more than sufficient for all your needs.

While braille often has contractions, it is not necessary to use them, and no reader of contracted braille would at all be confused by uncontracted braille (where you letter-for-letter convert.) Pretty straightforward. Load the tape, dial the letter you want (they appear in print and braille,) and squeeze the trigger. Just make sure to use the number symbol before numbers.

You could also pay a professional braille transcriber to do this, https://nfb.org/braille-transcription-resource-list is a list of some options.

You could also make your own labels with a braille slate and stylus and a photo chart of braille letters along with a sheet of plastic adhesive tape. This is cheap (about $7 for all supplies to make 1 page) but very time consuming.