gistfile1.txt

var list = """George Washington
John Adams
Thomas Jefferson
James Madison
James Monroe
John Quincy Adams
Andrew Jackson
Martin Van Buren
William Henry Harrison
John Tyler
James Knox Polk
Zachary Taylor
Millard Fillmore
Franklin Pierce""";

var acorn = JSTalk.application("Acorn");
var doc = acorn.open("/Path/To/Template.acorn");

var lines = list.split(/\r?\n/);

for (idx in lines) {
    var name = lines[idx];
    
    // the second layer must be a shape layer for this to work.
    var shapeLayer = doc.layers()[1]
    
    // and we have to already have a text box as the single element on the layer
    var textShape = shapeLayer.graphics()[0]
    
    var html = "<span style='font-size: 25pt; color: white; font-weight: bold;'>" + name + "</span>"
    
    textShape.setHTMLString(html)
    
    // save it to where you want as a PNG
    doc.dataOfType("public.png").writeToFile("/tmp/template-" + name + ".png");
}