How to automate addition of plugins to bundles?

[Bardo91]

Could you extend the example with a "how to add Qt Plugins"?

I am learning about how to configure properly a qt project for deployment but I cannot completely understand the process of exporting the plugins in macosx. In windows I am just copying the plugin directory but it seems that there are smarter solutions (https://stackoverflow.com/questions/35612687/cmake-macos-x-bundle-with-bundleutiliies-for-qt-application). But cannot make them work properly.