如何在gradle中添加jar的清单文件中的空行

plugins {
    id 'com.github.ManifestClasspath' version '0.1.0'
}

android {
    ...
    manifestPlaceholders = [LINE_BREAK: "\n"]
    applicationVariants.all { variant ->
        variant.outputs.all {
            manifest.outputFile = manifest.outputFile.replace(".xml", "_${variant.name}.xml")
        }
    }
}

jar {
    manifest {
        attributes 'Manifest-Version': '1.0',
                'Main-Class': 'com.example.Main',
                'Class-Path': configurations.runtimeClasspath.collect { it.getName() }.join(' '),
                'Line-Break': "${manifestPlaceholders.LINE_BREAK}"
    }
    from('src/main/empty_manifest.xml') {
        into('META-INF')
        rename { String fileName -> 'MANIFEST.MF' }
    }
}