How to have libgtk-4-media-gstreamer on nixos

back to my hanabi installation

And based on your advice, i think the extra environment variables you mentioned is GST_PLUGIN_SYSTEM_PATH_1_0 which will be available when I have gst_all_1.gstreamer in my environment.systemPackages

I kinda understand that I need to add something like this in my hanabi installation in order to wrap it:

preFixup = ''
  wrapGAppsHook ??? --prefix GST_PLUGIN_SYSTEM_PATH_1_0: ???
'';

However, I can’t really wrap my head around it (no pun intended) and I feel like I’m doing something else completely different or completely wrong.