I am afraid adding of additional information when exporting to Excel is not support. Nevertheless a possible solution is to use a ExportInfrastructure
to manually generate the exported structure and add the additional information at the top of the exported data. I would recommend you to examine the following help article
which demonstrates to how use the ExportInfrastructure
. Also you could check out the following help article
which describes how to use the new DPL
framework to export the data to xlsx
I hope this information helps.
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