That is currently sadly not possible. I however just added that functionality:
https://github.com/n8n-io/n8n/commit/e98fa3356d15efa705da680df83da7a959fbbf5d
It will be released with the next version. I will update here once it is available.
The latest version will then have a “Range” option that can be added on the Spreadsheet-File node. If it gets set to 1 it will read from the second row (0 because it is zero-based).