In that case, the plugboard will work. The version of the book in the calibre library won't have it in the file. But, using send to device or save to disk will update the tags for any reader that does show the tags.
An alternative is to add a jacket. These are added as a page after the cover with a copy of the metadata. I haven't done it, but I believe the template used can be customised to include different metadata fields. For that, have a look at the calibre help, or ask in the calibre forum.
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