Changing keybindings for arrows in Alt+Tab application switcher in Gnome 3

In Gnome 3 you can enter dconf-editor and navigate through lots of settings. Amongst others you can navigate to /org/gnome/desktop/wm/keybindings/ to find that Alt+Tab brings up the application switcher. You can change the keybinding for the application switcher or even add new ones in addition to the ones already present. However, once the application switcher is open, and while you're still holding down Alt, you can use the arrows to navigate within it. I'd like to add custom keymappings hjkl in addition to the arrows, but I cannot find the keymappings for this any place in the dconf-editor (yes, I actually looked through the whole thing and didn't find it). Does anyone know where I can find these settings? Thanks.