How would you go rewriting this task so that its arguments take a full

CopySpec

so it's possible to write

from(project.tasks.named(configTask))
		from(project.tasks.named(sourceTask)) {
			into("kotlin")  // ← this
		}

(like is possible with the native

Copy

and

Sync

tasks)?

Probably depends on whether you want to use Gradle internals. (See https://github.com/gradle/gradle/issues/34235 and https://github.com/gradle/gradle/issues/34240)