Adding a tinymce plugin in my plone addon

I want to provide a tinymce plugin within my plone addon (Plone 5). I think the already registered directory "theme" should be a practical place. There I add a folder tinymce-plugins and put my plugin there. In the configuration of the TinyMCE I add a line in the field for custom plugins:


Unfortunately the location is resolved as


instead of


What is the right place to add the plugin and how do I address it in the TinyMCE configuration.

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