Hi Eli,
as ZBP _SEG seems to be a custom field on the BP I expect that you need to at least some custom code. The link posted by Shobhit below give a very nice overview what to do.
One thing you could try is to add a custom conversion exit to the domain of ZBP_SEG. I never tried this but maybe you can get the description of the attribute in the alert without the need to develop a custom fact gathering service,
Christian