JavaxPorts jfxmobile-plugin: Failure if classes more than 65535

Question

When I do a

gradle android

with the jfxmobile-plugin on my JavaFX-application I get

...
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':mergeClassesIntoJar'.
> archive contains more than 65535 entries.

To build this archive, please enable the zip64 extension.
See: https://docs.gradle.org/3.2.1/dsl/org.gradle.api.tasks.bundling.Zip.html#org.gradle.api.tasks.bundling.Zip:zip64

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

The gradle file looks like this:

    buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'org.javafxports:jfxmobile-plugin:1.3.2'
    }
}

apply plugin: 'org.javafxports.jfxmobile'

mainClassName = 'de.package.of.application.ClientApp'

dependencies {

    compile 'com.annimon:stream:1.0.1'
    compile 'com.jakewharton.threetenabp:threetenabp:1.0.4'
    compile 'com.gluonhq:charm:3.0.0'

    androidRuntime 'com.gluonhq:charm-android:3.0.0'
    iosRuntime 'com.gluonhq:charm-ios:3.0.0'
    desktopRuntime 'com.gluonhq:charm-desktop:3.0.0'   

    compile fileTree(dir: 'target/dependencies', include: '*.jar')
    runtime fileTree(dir: 'target/dependencies', include: '*.jar')    
}

repositories {
    jcenter()
    maven {
        url 'http://nexus.gluonhq.com/nexus/content/repositories/releases'
    }
}

jfxmobile {
    ios {
        forceLinkClasses = ['ensemble.**.*']
    }
    android {
        applicationPackage = 'org.javafxports.ensemble'
        compileSdkVersion = '21'
        androidSdk='C:/Tools/android-sdk-windows'
    }
}

Over the last years since Javafx exists the application has become, I would say, a 'bigger' one; a fat-client with many own classes but also many third-party dependencies. I found an article about the jfxmobile-plugin and thought 'Why not give it a try?'. The current issue is the one described in this question. I already stripped down the application to reduce classes to a minimum so the application still makes some sense in some way but it does not help.

Does anyone have a suggestions how to solve it?