Adding a row to a named range - google-apps-script

Question

I have a named range in Google Sheets (A1:K14). All I'm trying to do is add a new row at the bottom of the named range. It seems like an easy task. The named range doesn't expand using this code and I don't get an error message. It does insert a new row outside of the named range, which is not what I'm trying to do. If I change to insertRowBefore (lastRow), the new blank row is inserted and the named range is expanded. I'm teaching myself GAS, so this is probably a simple mistake on my part
var sheet = SpreadsheetApp.getActiveSheet()
var Range = sheet.setActiveRange(range);
var data = Range.getValues();
Logger.log(range.getA1Notation());
var lastRow = SpreadsheetApp.getActiveSheet().getRange('DataRange').getNumRows();
SpreadsheetApp.getActive().insertRowAfter(lastRow);
return range;

Answer 1

Adding rows and/or columns to a namedRange
This function has the defaults setup to add one row.
//r is number of rows to add
//c is number of columns to add
function addRowAndColumnsToNamedRange(name,r,c) {
var name=name||'One';//default name
var r=r||1;//default number of rows to add
var c=c||0;//default number columns to add
var ss=SpreadsheetApp.getActive();
var nrgA=ss.getNamedRanges();
for(var i=0;i<nrgA.length;i++) {
if(nrgA[i].getName()==name) {
var nr=nrgA[i];
var h=nr.getRange().getHeight();
var w=nr.getRange().getWidth();
var sh=nr.getRange().getSheet();
var row=nr.getRange().getRow();
var col=nr.getRange().getColumn();
var rg=sh.getRange(row,col,h+r,w+c);
ss.setNamedRange(name,rg);
break;
}
}
}
Class NamedRange
Class Range

Answer 2

I think one of the approach can be to get that NamedRange and expand it explicitly.
Something like this:
Get that NamedRange using getNamedRanges() :
Set range of that NamedRange including new row using setRange(range)