Unable to set 'readOnly' property

[remory08]

https://stackoverflow.com/questions/53328479/cannot-set-readonly-property-using-angular-ckeditor

I need to dynamically set the readOnly property on an editor. I haven't been able to set it, even hard-coded. I have attempted setting it in the config object for the specific editor, in the main config file as well as on instanceReady event firing.