Did you know that WindUp can export data rendered in reports?
Yes, you obviously did, it is documented feature for long time, but have you really tried and have you consumed the result in your application migration?
see a very short visual demo on sample application jee-example-app-1.0.0.ear from Windup distribution.
Short demo how to use Windup export CSV results
and opening the CSV file in LibreOffice Calc (you can use your preferred spreadsheet application if you'd like)
Windup exported results into CSV
I hope you'll learn something useful.
 Official Migration Toolkit documentation- https://access.redhat.com/documentation/en/red-hat-jboss-migration-toolkit/2.7/single/windup-user-guide#Export-the-Report-for-Use-by-Spreadsheet-Programs
 Quick Wiki doc - OBSOLETE Export the Report for Use by Spreadsheet Programs · windup/windup Wiki · GitHub