No output from post linker script using CrossScript

I am once again modifying an output binary to format for the UF2 bootloader.  I'm starting with a very basic postlink.js file that looks like this:

function postlink(filename) {
WScript.Echo("Hello World!\r\n")
WScript.Echo("Filename = "+ filename + "\r\n")
}

And, in my release properties I edit the post link command to be:

"$(StudioDir)/bin/crossscript" -load "$(ProjectDir)/postlink.js" "postlink(\"$(OutDir)/$(ProjectName).bin\");"

But I see no results in the command output when I rebuild the project in release configuration.

Post-link command

shows up at the end, but no "Hello World!"

I've done this before in version 3 I believe.  I am currently using version 4.3.2.

Microsoft provides a python script uf2conv.py to do this job.  Can the post link command run this python script rather than converting the script to CrossScript?

Thanks,

Mike.