Add this to the root build.gradle

JaCoCo multi-module aggregate task

// JACOCO AGGREGATE TASK
task jacocoRootReport(type: JacocoReport) {

    subprojects.each {
        sourceSets it.sourceSets.main
    }

    classDirectories.setFrom(files(classDirectories.files.collect {
        fileTree(dir: it, exclude: [
                    '/com/package/subpackage/**'
        ])
    }))

    executionData fileTree(project.rootDir.absolutePath).include("**/build/jacoco/*.exec")

    reports {
        csv.enabled false
        xml.enabled true
        html.enabled true
    }
}