How to publish an artifact produced by a different subproject

Help/Discuss
1

Hi!

Am I using the maven-publish plugin to publish some artifact (in this case a version catalog).

Now I want to add an artifact (with metadata) to the publication. This artifact is produced by a subproject.

I have declared an outgoing configuration that contains the artifact:
producer/build.gradle.kts:

val producerTask by tasks.registering {
    val outFile = project.layout.buildDirectory.file("greeting.txt")
    outputs.file(outFile)

    doLast {
        outFile.get().asFile.writeText("hello world!")
    }
}

val markerAttribute = Attribute.of("com.example.greeting", String::class.java)
dependencies.attributesSchema {
    attribute(markerAttribute)
}
val greetingConfiguration by configurations.creating {
    isCanBeResolved = false
    isCanBeConsumed = true
    outgoing {
        artifact(producerTask)
    }
    attributes {
        attribute(markerAttribute, "true")
    }
}

Now I want to include this configuration in the publishing of a different module by modifying the published component:

consumer.gradle.kts:

(components["versionCatalog"] as? AdhocComponentWithVariants)
    ?.addVariantsFromConfiguration(?????) {  }

I have tried to create a configuration with the appropriate attribute and a dependency to project(":producer"), but then the generated metadata for publishing looks like this:

…
    {
      "name": "greeting",
      "attributes": {
        "com.example.greeting": "true"
      },
      "dependencies": [
        {
          "group": "myproject",
          "module": "producer",
          "version": {
            "requires": "unspecified"
          }
        }
      ]
    }
…

However I want it like:

…
    {
      "name": "greeting",
      "attributes": {
        "com.example.greeting": "true"
      },
      "files": [
        {
          "name": "greeting-0.1-SNAPSHOT.txt",
          …
        }
      ]
    }
…

Is this possible?