I use a device with multiple OSes installed and I switch between them and most of them I have brave installed as the main browser with all of them connected to the same sync chain.
Sometimes I need to change add or modify System shortcuts in brave settings, but since they are not synced every time I switch I have to make all the modification I’ve done in anyone to every system.
I am not aware of some way of exporting the shortcuts to some file and importing it from another but even if there was it will still be little tiring/slower than if it was done by sync automatically.