Hey @mondob!
Using fileInput.parsedValue[0] you should be able to get a JSON representation of your CSV as long as Parse files is turned on:

With that, you might try using a Query JSON with SQL query to map the columns with something like:
SELECT col1 AS alias1, col2 AS alias2 FROM {{ fileInput.parsedValue[0] }}
Does that sound like it could work?
If you prefer to use JavaScript something like this may also do the trick ![]()