This isn't possible
You can store all the .xaml file paths that you wish to invoke into variables or an array, then you can use that in your Invoke Workflow to call it and you can tell which part of the process you are currently at.
You can also use System.Environment.CurrentDirectory (or Directory.GetCurrentDirectory) and Directory.GetFiles() to gather the .xamls located in the folder.
And, if your filenames are named where they are in the order of the process, you can store them into a list and use that list in your Invokes.
One more thing is you can get the filename only by using Path.GetFileName(), but requires a full path I think.
Or you can also use a .Split like filepathvariable.Split("\"c).Last