You can change the text style using a similar bit of JavaScript, by setting the .richContents property rather than the .contents property.
Here's an example that reformats the label on selected measurement(s) and appends a warning on a new line underneath:
var sAnnots = this.selectedAnnots;
if (!sAnnots) app.alert("No measurements are selected")
else {
for (var i=0; i<sAnnots.length; i++) {
var spans = new Array();
spans[0] = new Object();
spans[0].text = sAnnots[i].contents;
spans[0].textColor = color.blue;
spans[0].textSize = 12;
spans[1] = new Object();
spans[1].text = "\n(do not scale)";
spans[1].textColor = color.red;
spans[1].fontStyle = "italic";
spans[1].alignment = "center";
var nProps = { style: "S", richContents: spans};
sAnnots[i].setProps(nProps);
}
}
Text rotation isn't possible.
