How to make extension recognize compiled .class files in Gradle project?

[ArmoredPony]

I have a project with Java and Kotlin source code. This project is being managed by Gradle. All compiled files are placed into a separate directory out, compilation process is also managed by Gradle through terminal. The extension correctly handles import of Java classes into other Java classes, however it does not recognize imports of files written in Kotlin. I do not expect this extension to recognize Kotlin files, however, they are compiled into .class files and put into out/package/name/ directory with respect to their package name. Can I make the extension recognize these .class files somehow? I tried to disable java.import.gradle.enabled and add "out" to sourcePath, then I tried to create and modify a .classpath file, I also tried to tweak Gradle config files, but nothing worked.

[ArmoredPony]

eventually I found out that you can create a .classpath file in project root and add a line like this

<classpathentry kind="lib" path="path/to/folder/with/class/files" />

and this extension will load them up. but for some reason, the extension resets this file from time to time. no idea why. worked around it by making this file immutable nvm, even if this file is immutable, the extension just ignores it when build.gradle is updated