Insert list item into a specific Table of google doc - list

Question

This is the point.
I've followed the suggest linked here More efficient way to append a list item after some text in Google Docs ,whose very helpfull tom me. But i have the problem mentioned at the bottom.
My placeholder is inside a known table within a google doc.
I've tried several ways to figure it out, but i didn't achieve.
Here below there is the portion of code of interest.
Note:
"CarattCentralGas1" is an array of values;
"DescrizioneCentralGas" is another array of values;
My intent is to insert a list, created if the if condition is true, at the placeholder place and than remove it.
Any ideas would be great!`
for (var i=0; i < CarattCentraleGas1.length; ++i)
{ var ValueToTest = CarattCentraleGas1[i][0];
Logger.log(ValueToTest)
if (ValueToTest ==='Presente')
{ var valueToextract = DescrizioniCentraleGas[i][0];
var search = '%Placeholder%';
var Table1 = body.getTables()[0];
var found = Table1.findText(search);
while (found) {
var elem = found.getElement().getParent().getParent();
var index = Table1.getChildIndex(elem);
Table1.insertListItem(index+1, valueToextract+';');
found = Table1.findText(search, found);}
Logger.log(valueToextract)}
}
var Table1Text = Table1.editAsText().replaceText('%CarattCentrale1%',"");
`
this is the template document I want to edit with the script.