How can I round a value to 2 digits

You can also do it this way:

Place this function in your transform directory:

//round1.js

(function(i) {
  var input = parseFloat(i); 
  var output = input.toFixed(1);
  return output;
})(input)

Then choose the Script ECMAScript profile:

It also gives you the correct rounding in the log:

Item 'astroAzimut' changed from 125.94 ° to 125.9 °

4.1.2. I’ll start the upgrade process!

Thank you. This works! I will upgrade to v5 and see if I make progress with the other solutions that Rich suggested. Thanks again.