[SOLVED] TinyMCE: How to add plugin after init?

In the Voyager project they allow you to modify TinyMCE though a callback function:

function tinymce_init_callback(editor)
{
    //...
}

The methods of the editor are listed here.

I know that one usually list the plugins on init:

tinymce.init({
  plugins: [
    'image textcolor'
  ],

But is it possible to add a plugin like image with the editor object after the initialization? I couldn't find such a function in the docs.

There was actually a merge request in 2020 which fixed this issue:

Now one can specify the plugins in the bread view like this:

{
    "tinymceOptions" : {
        "plugins": "image textcolor"
    }
}