Welcome to our community.
Theoretically there might be an option to use/install network-manager-gnome package.
But, there is a big BUT. This will pull network-manager as software package/dependency, which is conflicting with DietPi network settings as we use ifupdown. If you really like using network-manager, you would need to remove our network configuration and setup an own one using network-manager. This include loosing the network configuration possibility to use our tool dietpi-config.
This is how it looks like
