How to create breakpoint in code used by kapt from a project's Gradle build?

I want to debug a Gradle build where I want to create a breakpoint in code from a dependency that is included in the "kapt" configuration, but that is not in any other configuration.

I have not found out how to open such a class so that I can add in a breakpoint.

I can open classes from the "implementation" configuration, but I can't see how to open classes from the "kapt" configuration.

If this isn't possible, IntelliJ should be modified to allow such access.