create one script include and there you will use getDisplayValue() while fetching the variable value.
now in your scripted rest api use that script include.
sample code for getting all ritm variables. make the changes based on your need.
var gr = new GlideRecord('sc_req_item');
gr.addQuery('request', current.sys_id);
gr.query();
while (gr.next()) {
var set = new GlideappVariablePoolQuestionSet();
set.setRequestID(gr.sys_id);
set.load();
var vs = set.getFlatQuestions();
for (var i = 0; i < vs.size(); i++) {
if (vs.get(i).getDisplayValue() != '' && +vs.get(i).getLabel() != '') {
gs.print("\n"+ '<b>' +vs.get(i).getLabel() + " = " + '</b>' + vs.get(i).getDisplayValue() + "\n");
}
}
blog for further details to use script include inside the scripted rest api.
https://www.servicenowtechminds.com/single-blog.php?id=23
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