Nuke OFX plugin – Custom Icon

Question

My question deals with the customisation of icons in the NUKE GUI. I know that menu.py file in C:\Program Files\Nuke11.2v3\plugins can archive locally such goal for a personal Gizmo.

But in my case, I have set my environment variable OFX_PLUGIN_PATH to C:\OFX_PLUGIN_PATH where I store various OFX bundles, each with the appropriated hierarchy (Contents, Resources, Win64 directories) and its own icon.

All my bundles belong to the same Group:

mDeclarePluginFactory(MyPluginFactory, {}, {});
void MyPluginFactory::describe(OFX::ImageEffectDescriptor& desc)
{
  ...
  desc.setPluginGrouping(PLUGIN_GROUPING);
  ...
}

It works fine. When I launch NUKE, it parse the OFX_PLUGIN_PATH, found all the bundles, display on the left menu all the discovered bundles in a same Group, with the correct icons.

My question is: how can I customise the group icon (I do not need the default icon)? Preferably with a mechanism inside the bundles hierarchy, and not locally, for distribution purpose.

Thanks!