It can be posted as a text file. There is a workflow activity called Attachment Note that generates an attachment to a record. You supply it a name and the data and it will create the attachment automatically.
Thinking via typing here...
Since you want this attached to the change record, the Attachment Note activity would need to be in the change workflow. I assume that parent value of the change_request record is the request and if so you could put a Run Script activity before the Attachment Note activity, loop through all the variables leveraging the parent reference and create the data for the attachment in a workflow scratchpad variable and then use that in the Attachment Note.
There is an OOB script that runs in the request.itil.approve.role email template for catalog request approval emails that may help you get all the variable questions and answers:
var keys = new Array();
var set = new GlideappVariablePoolQuestionSet();
set.setRequestID(item.sys_id);
set.load();
var vs = set.getFlatQuestions();
for (var i=0; i < vs.size(); i++) {
if(vs.get(i).getLabel() != '') {
template.space(4);
template.print(' ' + vs.get(i).getLabel() + " = " + vs.get(i).getDisplayValue() + "\n");
}
}
Obviously the template.print items would need to be replaced by something else, but again this should get you going.
