how to add different interface for each unit with juju ovn-chassis bridge-interface-mappings

I have 5 compute nodes, 4 of which have the same interface, while the 5th one has a different interface that needs to be added to br-ex. However, I am unable to find a way to configure it per machine or update the settings for a specific OVN unit (ovn-chassis/15) . Any insights on this would be appreciated.

CONFIG File:
ovn-chassis:
bridge-interface-mappings: br-ex:enp4s0f0
ovn-bridge-mappings: physnet1:br-ex

juju deploy --channel 23.09/stable --config $CONFIG ovn-chassis

admin@mass-controller:~$ juju status ovn-chassis
Model Controller Cloud/Region Version SLA Timestamp
openstack maas-controller maas-one/default 3.6.5 unsupported 22:01:17Z

App Version Status Scale Charm Channel Rev Exposed Message
nova-compute 28.2.0 active 5 nova-compute 2024.1/stable 771 no Unit is ready
ovn-chassis 23.09.3 error 5 ovn-chassis 23.09/stable 296 no hook failed: “ovsdb-relation-joined”

Unit Workload Agent Machine Public address Ports Message
nova-compute/0* active idle 1 11.11.11.39 Unit is ready
ovn-chassis/10* active idle 11.11.11.39 Unit is ready
nova-compute/1 active idle 2 11.11.11.40 Unit is ready
ovn-chassis/14 active idle 11.11.11.40 Unit is ready
nova-compute/2 active idle 3 11.11.11.41 Unit is ready
ovn-chassis/13 active idle 11.11.11.41 Unit is ready
nova-compute/3 active idle 4 11.11.11.42 Unit is ready
ovn-chassis/12 active idle 11.11.11.42 Unit is ready
nova-compute/6 active idle 7 11.11.11.81 Unit is ready
ovn-chassis/15 error idle 11.11.11.81 hook failed: “ovsdb-relation-joined”

Machine State Address Inst id Base AZ Message
1 started 11.11.11.39 compute3 ubuntu@22.04 default Deployed
2 started 11.11.11.40 compute4 ubuntu@22.04 default Deployed
3 started 11.11.11.41 compute5 ubuntu@22.04 default Deployed
4 started 11.11.11.42 compute6 ubuntu@22.04 default Deployed
7 started 11.11.11.81 compute8 ubuntu@22.04 default Deployed