I try to use the `org.asciidoctor.jvm.gems` plugin which uses this plugin under the hood. For the `AsciidoctorGemPrepare` which extends `AbstractGemPrepareTask`, I do not see a good way to configure additional JVM arguments. The `Asciidoctor` task for example extends the `AbstractJvmModelExecTask` task and thus has a `jvm { ... }` function to do that. The only way I have seen for the `AsciidoctorGemPrepare` task is to either use Groovy DSL as there the protected `foo()` can be used like `foo().jvm { ... }`, or as this project is done in Groovy, in Kotlin DSL do `(metaClass.getMetaMethod("foo", emptyArray()).invoke(this, emptyArray()) as JRubyExecSpec).jvm { ... }`, but both are a bit sub-optimal I'd say. :-)