What the built-in reports are good at
A template configured once and run on a schedule — mileage for the month, fuel by vehicle, a trip list for a period — is exactly what the reporting engine was built for. It reads the same messages FleetTAB reads, and for that job it needs no help from anyone.
If nobody in your organisation is exporting a report to a spreadsheet on a schedule and reshaping it by hand, you can stop reading here: an add-on would be overhead bought for nothing, and we would rather say so before an invoice than after one.