Script for adding file name to Headline field in metadata

I've found scripts for adding file name to Title and file name to Decription fields but I need one to add file name to Headline field. I've tried modifying those other scripts to work for the Headline but I can't get it to work. Seems like the Headline field is blocked from having data added to it.

By @Josh32154076x9ig

You need to target the appropriate namespace for the different metadata entries...

Headline = http://ns.adobe.com/photoshop/1.0/ 

Title = http://purl.org/dc/elements/1.1/ 

It also depends on whether one is writing to the legacy IPTC or current XMP metadata.

In short, it's a minefield!

@Josh32154076x9ig 

// https://forums.adobe.com/thread/656144  
// https://forums.adobe.com/message/9744916  
// https://forums.adobe.com/message/9745231  
#target bridge  
addNametoMeta = {};  
addNametoMeta.execute = function(){  
  var sels = app.document.selections;  
  for (var i = 0; i < sels.length; i++){  
var md = sels[i].synchronousMetadata;  
    md.namespace = "http://ns.adobe.com/photoshop/1.0/";  
    var Name = decodeURI(sels[i].name).replace(/\.[^\.]+$/g, ' '); //remove extension   
    md.Headline = md.Headline + Name;  
  }  
}  
if (BridgeTalk.appName == "bridge"){  
var menu = MenuElement.create( "command", "Filename to XMP and IPTC Headline", "at the end of Tools");  
  menu.onSelect = addNametoMeta.execute;  
} 

Or:

#target bridge

addTitleToHeadline = {};

addTitleToHeadline.execute = function () {
    var sels = app.document.selections;
    for (var i = 0; i < sels.length; i++) {
        var md = sels[i].synchronousMetadata;
        md.namespace = "http://ns.adobe.com/photoshop/1.0/";
        var Name = decodeURI(sels[i].name).replace(/\.[^\.]+$/g, ' '); //remove extension
        md.Headline = Name;
    }
}

if (BridgeTalk.appName == "bridge") {
    var menu = MenuElement.create("command", "Add Filename to Headline", "at the end of Tools");
    menu.onSelect = addTitleToHeadline.execute;
}

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html