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How to give a default value to Mistral workflow after a conditional checking

I am trying to pass a default value to a parameter if the value is not set in a Mistral workflow. How can I do this? This is my code sample, I am passing a these values using a .meta file. I want to know is there a way I can set a default value in this .meta file or check if the value is not set then take this value as the default in the action itself (shown below)?

LifecycleConfiguration:
          Rules:
          - Expiration:
              Days: <% $.bucket_days %>
            ID: "some-id"
            Filter:
              Prefix: "<% $.bucket_prefix %>"
            Status: Enabled
            NoncurrentVersionExpiration:
              NoncurrentDays: <% $.bucket_noncurrentversion %>