How to have two different gateways on two different bridges in Proxmox VE

We have two different network interfaces eno1 and eno2 (eno3 and eno4 are not connected) and we have one bridge vmbr0 we want to add another bridge vmbr1 and we want to set two different gateways on these bridges. Currently vmbr0's gateway is set to 172.20.10.1. now we want to create another bridge vmbr1 and set it's gateway to 172.20.1.40 I entered these parameters for creating vmbr1 but the proxmox interface doesn't allow this This is my configuration and this is the output of ifconfig. I am using Proxmox VE 5.4-13 on HP ProLiant DL380p Gen8 and uname -a shows Linux vmserver1 4.15.18-21-pve #1 SMP PVE 4.15.18-48 (Fri, 20 Sep 2019 11:28:30 +0200) x86_64 GNU/Linux The main reason I want to do this is for creating VMs on two different networks. **The networks are separate and NOT PHYSICALLY CONNECTED to each other.**