How to load Firmware without .hex or .bin file

I successfully customized my OpenEVSE GUI and can access it on localhost. I followed the instructions from the official GitHub repository: OpenEVSE GUI v2.

After building the project, I noticed that it only updates some JavaScript files in the dist folder and does not generate any .hex or .bin files. Since I usually upload firmware using the OpenEVSE programmer, I am unsure how to proceed with flashing my custom GUI onto the controller.

Could someone guide me on how to properly upload my modified GUI firmware to the OpenEVSE controller?

Thanks in advance!