It's unfortunately not possible with the shader. For context the shader utilizes the "hint_normal_roughness_texture" to calculate the edge notmal to handle the highlights. That is unfortunately not available in web builds. There also isn't a functional alternative for me to use. I did look into it again this morning. Normally we do web exports. I think there are only 3 games on our profile that don't have web exports.
You are welcome to download and play in a vm if you're nervous. It's what I've done in the past if someones itch profile looks sketch.