mapping multiple Bugzilla values to a single work item field

I am working on a complex Bugzilla mapping into a highly customized work item type with customized fields. I have a need to map several fields that were in Bugzilla into a single "miscellaneous" field in a work item. And, ideally, the resulting field would be separated by some kind of heading indicating the source of the field. For example, in Bugzilla I have the fields:

<bug_id>1234</bug_id>
<op_sys>Linux</op_sys>
<cf_bld_found>Build 2.0</cf_bld_found>

That I need to map to a text field in the new work item that would display as something like:

Bugzilla imported values:
Bug ID: 1234
Operating System: Linux
Build found: Build 2.0

Anyone know of a way to do this?