Passing runtime arguments into docker image resource

We are trying to pass in runtime arguments when starting a docker image resource. We are able to achieve this in jenkins through utilizing the below configuration:

We are trying to enable testContainers within Concourse and need the ability to create sibling containers from within the image resource. Is there a similar way to do this in Concourse?

You need test sidecars. Currently I solve that by creating a DIND task (rather than a DIND resource, like docker-image) and from within that DIND workspace, I use docker-compose to stand up sidecars.