Substance painter python, custom export

Current trying to create a python script that will export a custom Output template in one click.

I'm trying to use a custom preset from an external location, example "C:\Users\Name\Documents\Adobe\Adobe Substance 3D Painter\assets\export-presets. The custom preset is called Test_Preset.spexp.

The variable above will build the export preset resource URL for output templates that comes with Painter, but I cant seem to locate what the context should be if I use a custom preset.