Of the columns available in this report, only the End of Support column can be edited by a user, and then, only in the Software Components report. And it is not an appropriate place for the type of data you’re looking to add.
I think that the Component Tag would serve your needs. It is quite flexible, and could serve other purposes beyond your idea. However, this column would need to be added to the Software Summary report by the BigFix developers.
I recommend that you submit a request for enhancement at HCL BigFix Product Ideas Portal - BFI.