How to run a document-level javascript?

I am trying to run a script that will extract all field names, their location, page, and type. How and exactly where would I add this script? I tried going to:

Tools > JavaScript > Document JavaScripts > Add
But this does not allow me to run a scrip, only to add or edit one. Can someone please help or point me to the documentation? Thanks.

Here is my script given by chat GPT:

function Extract()
{var allFields = this.getFields();

var fieldInfo = [];

for (var fieldName in allFields) {
  var field = allFields[fieldName];
  var rect = field.rect;

  fieldInfo.push({
    "Name": field.name,
    "Type": field.type,
    "Page": field.page + 1, // Acrobat's page index starts at 0, so adding 1 to make it human-readable
  });
}

if (fieldInfo.length > 0) {
  var output = "Name,Type,Page\n";
  for (var i = 0; i < fieldInfo.length; i++) {
    var info = fieldInfo[i];

    output += info.Name + "," + info.Type + "," + info.Page + "\n";
  }

  // Save the CSV string to a file.
  var file = new File(app.activeDocument.path + ".csv");
  file.open("w");
  file.write(output);
  file.close();
} else {
  console.println("No fields found.");
}

}