With the Gradle JaCoCo plugin, how to include coverage data of an additional test task?

I am using Gradle in version 8.13.

I am using the Gradle JaCoCo Plugin.

Besides the default Gradle test task, I have added an additional test task to some of the Gradle subprojects:

var integrationTestTask = tasks.register<Test>("integrationTest") {
   …
}

How can I tell the Gradle JaCoCo plugin to generate the coverage data for the integrationTestTask and include it to the coverage data of the default Gradle test task?

This only works when the test suites are created with the JVM Test Suite plugin:

testing {
    suites { 
        val test by getting(JvmTestSuite::class) { 
            useJUnitJupiter() 
        }

        register<JvmTestSuite>("integrationTest") { 
            dependencies {
                implementation(project()) 
            }

            targets { 
                all {
                    testTask.configure {
                        shouldRunAfter(test)
                    }
                }
            }
        }
    }
}