How to change .desktop file for itch.io launcher?

I’m having troubles launching the itch.io launcher:

[14826:0809/042220.091398:FATAL:gpu_data_manager_impl_private.cc(445)] GPU process isn't usable. Goodbye.

I know that --no-sandbox option is a good workaround, and it actually works for this problem I’m experiencing, so my question is: how can I “overwrite” itch.io’s .desktop file to execute itch with the workaround option?