I think you cannot just convert the text in database from the previous question where it was entered in lowercase. However if you create a further hidden question of type short text, you should be able to use the function to get the result you want and that result should be stored in the database. So you would get an extra field (you can call it PLATE_UPPER for example) and user would never even see the question. I have not tested it yet, but it should work.
manual.limesurvey.org/Expression_Manager...o_autofill_an_answer
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