Implement some sort of self reference to inventory

[bsda]

Describe the bug/feature
It would save us a lot of duplication if we could have some sort of ${self} reference to the inventory

To Reproduce
For example:
I need to add this configmap to multiple components:

config_maps:
  monitoring-registry:
    mount: /opt/spinnaker-monitoring/registry
    data:
      igor.yml:
        value: "metrics_url: http://localhost:8088/spectator/metrics"

The port is the only thing that changes per component

Having the capacity of using something like this would be helpful:

value:  "metrics_url: http://localhost:${self:ports:http:service_port}/spectator/metrics"

The value in this case would reference to

parameters:
  components:
    spin-igor:
       ...
      ports:
        http:
          service_port: 8088

Additional context
I'm guessing this is one for the reclass package but I couldn't create issues there

[MatteoVoges]

Im currently working on a feature in reclass, that supports relative paths. I think this is exactly what you want to do. It should be merged with the next minor release ...

[github-actions]

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