If I already have a VPN always on on my system, do I need to set up a gluetun container? - eviltoast

I honestly can’t get my head around this. I have a machine with Linux (endeavouros), and docker with a few containers. Since I want all the traffic from this system to go through the VPN, do I need to set up gluetun? I think not, but I am not 100% sure…