How do i use a cfg file on wireguard?

Ive used wireguard on android, my vpn generates this config file and i open it in wireguard and its all done, theres even a simple killswitch toggle. Im looking at openwrt wireguard setup videos and theres tons of tedious steps to perform (and even worse on linux), and i have yet to see any sort of killswitch option like on android or ddwrt's openvpn settings have. Am i missing something here, can i just upload the cfg file, set the killswitch to on and be done with it?

The config should be a plain, readable (*.ini style), text file, just copy'n'paste the ~6 entries.