Thankyou for using Microsoft Q&A platform and thanks for posting your question here.
Glad to know that you were able to resolve the issue by yourself.
As rightly mentioned by you, you can use the "Headers" option in Sink settings to add the header or title above the column names in your dataset.
You can check out the following video for the implementation: How to add header or title above column names in file using mapping dataflow
Kindly accept the answer if this is the approach you have followed to achieve the requirement. Thankyou.