Typography sector not found

When using trying to add a font to the style manager, I use the following code: const prop = editor.StyleManager.getProperty('typography', 'font-family'); prop.set('options', [ {value: "'Oswald', sans-serif", name: 'Oswald'}, ... ]); However, when I use this inside a plugin (in the index.js) I am creating, I call it with editor.on('load',....) I keep getting 'typography' sector not found. However if I call it outside of the plugin (in the index.html) in the same way, where I am initializing the editor with all the configs, it works. So I was wondering, can we not add new fronts in a plugin so...