How do I add
<i> in CKeditor 5 without hacking a core module?
In Text formats and editor, for the allowed HTML tags, the following text is shown-
With CKEditor 5 this is a read-only field. The allowed HTML tags and attributes are determined by the CKEditor 5 configuration. Manually removing tags would break enabled functionality, and any manually added tags would be removed by CKEditor 5 on render.
Using the newly added tag for font awesome just ends up stripping the tag out anyway.