You can import a CSV using the JIRA Importers plugin (included in JIRA). If you include the key and summary of an issue that already exists you will update that issue instead of creating a new one.
If you had an issue, TEST-123 with a description of apple, and you imported the following CSV:
key, summary, description TEST-123, Fruit, Banana
The description of TEST-123 would now be Banana.
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