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In the Excel Extract it is possible to use the tickbox to select whether there is a header line in the Excel and determine the columns that should be extracted (eg. 1, 3, 5 etc.). Also it is possible to change the names of the headers (fields) in the extract. None of this is possible in the Google Sheets extract which is quite inconvenient to work with. Due to the above mentioned limitations it is for example currently impossible to extract columns which have no header from a Google Sheet.
Thank you for your great idea. While we cannot commit to a specific target version, we will consider adding it to our future internal backlog. If you can add further information about the context of this feature, please add it here so we can evaluate it more fully.