Is it possible to define a default shader?

[jkms]

I see in the EmulatorJS documentation (https://emulatorjs.org/docs/options#ejs_defaultoptions) that it's possible to configure a default shader like this:

EJS_defaultOptions = {
    'shader':'crt-mattias.glslp'
}

But I can't find anywhere to enter this configuration - certainly nowhere that will survive a container reboot.

Is there a better way to do this? Can this feature be added?

Basically, I just want myself and any other user I share my collection with to be able to login and have all of their games run with a CRT shader without the end user needing to configure anything.