I would like to add a few font-sizes to the web_editor toolbar.

The listed font-sizes are definded in this front end xml file:

https://github.com/odoo/odoo/blob/15.0/addons/web_editor/static/src/xml/editor.xml

This file is referenced from 2 places:

It is loaded from the toolbar javascript file

https://github.com/odoo/odoo/blob/15.0/addons/web_editor/static/src/js/editor/toolbar.js

and it is added to the web.assets_qweb assets bundle in the manifest file:

https://github.com/odoo/odoo/blob/15.0/addons/web_editor/__manifest__.py

When i saw that it was defined in an xml file, i was happy and thought i could easily change it by extending it and using an xpath query ...

But that does not seem to be as easy for front-end xml as it is for back end templates.

Any clue how to achieve this ?