How to add dir to PATH for executing programs

Kate requires omnisharp to be added to the PATH. I'm not sure which configuration file needs to be modified to include omnisharp in Kate's PATH. Only when I start Kate through a console which contains omnisharp in its PATH it works. However, I don't think it's a good solution to simply call exec bash with a PATH export on the .desktop file, it looks like a botched job. It's the LSP Client, more specifically, the one complaining. Is there an rc file for the LSP Client, perhaps? I'm completely lost.