Using variables/constants in input

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Consider the following code:

input {
  http_poller {
    urls => {
      myurl1 => {
        ...
        password => 123456
      }
      myurl2 => {
        ...
        password => 123456
      }
      ...
    }
    ...
  }
  ...
}

Can I replace password => 123456 with something like password => ${mypassword} without using environment variables?

Although environment variables could solve the problem, I have many "constants" in my code that are nearly/exactly identical in my pipeline and I think it would be unwidely to pass them as env vars on every execution.

I'm considering generating my pipeline programatically from a template. Is that the most common approact to this kind of problem?

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