I'd think one way or the other, you'd have to convert the book again to incorporate new data into what is not just a text file where you can open it and place the new stuff up front, in the middle or even at the end. These files are "compiled" and whether your rename the process to "add metadata" or still call it "convert" would make no difference - somehow the old book needs to be processed (open/separate to appropriate components), the new data added and then reprocessed back to an appropriate mobi form (in this case).
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