JIRA Command Line Interface (CLI) can help with this. You can use setFieldValue with the appendText parameter. Combine that with the runFromIssueList action with a JQL query to determine what issues need the field to be updated. Reference: How to use runFromIssueList.
You'll need to script an update to each and every text field.
Personally, I wouldn't bother. A text field is supposed to be for free-text, and putting prefices in text feels like a bodge. If you really need to classify stuff like that, you should almost certainly be using a new field for the prefix.
Could you explain the reason you think a prefix is the right thing to do? Or the problem you're trying to solve with it at least?
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