You can use dconf to manipulate gnome shortcuts from terminal. For example this lists where gnome saves its screenshots

dconf dump /org/gnome/gnome-screenshot/

dconf dump /

dconf dump /org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/

dconf read /org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/binding

dconf write /org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom1/binding "'<Super>c'"

• Ubuntu 20.04.3 LTS
• GNOME Shell 3.36.9

• gsettings

• https://askubuntu.com/a/585204/635772
• https://askubuntu.com/questions/487206/dconf-change-a-string-key