Currently, header data cannot be imported via .csv import, headers can be present or absent and their position does not impact the import. This behavior is by design and the documentation for this behavior can be found in the Help Center > Signals Notebook > Working with Information Items > Working with Table.
Additionally, there is an idea within our Ideas Portal that proposes to add this possibility. The idea is classified as "Future consideration", in case this idea is of your interest, we invite you to enter and vote for this idea at the following link Support header data in csv import | Revvity Signals Software Ideas.
If you want to know what each one of the status labels of the Ideas in our Ideas Portal means, we recommend you read the following article Signals Notebook: How to interpret the status labels of an idea in the Ideas Portal