Routing between bridge networks

Incus
1

I have set up two bridged networks, one of them with NAT enabled. How do I set up static routing between them? I assume, ACLs are somehow involved, but I can’t find documentation on this. Just for reference, here’s the networking setup.

$ incus network show ext0
config:
  ipv4.address: 172.22.0.1/24
  ipv4.nat: "true"
  security.acls.default.ingress.action: allow
description: ""
name: ext0
type: bridge
used_by:
- /1.0/instances/gw
managed: true
status: Created
locations:
- none

$ incus network show int0
config:
  ipv4.address: 172.26.0.1/24
  ipv4.nat: "false"
  security.acls.default.ingress.action: allow
description: ""
name: int0
type: bridge
used_by:
- /1.0/instances/my-service
managed: true
status: Created
locations:
- none