Shortcuts to enable/disable a touchpad in GNOME3 on Wayland

I'm trying to add custom shortcuts to enable/disable a touchpad on my laptop. I have GNOME 3 on Wayland. Using a suggestion from https://unix.stackexchange.com/a/571537/138312 , I managed to do it using a terminal. **However**, if I put exactly the same commands into shortcuts (using a GUI, the only way I know), they don't work. Does anyone know the solution for this, or any other way around to have shortcuts for a touchpad? Some details, if needed: Lenovo Thinkpad T450s, Debian 9, Gnome 3.22.2