CKEditor dsfr css bleeding

Problem/Motivation

In UI suite DSFR info we have:

ckeditor5-stylesheets:
  - /libraries/dsfr/dist/core/core.css
  - /libraries/dsfr/dist/utility/icons/icons.css

Problem is this css is not prefixed for .ck-content and so bleed everywhere.

Solution could be to create a controller to prefix on the fly the css with .ck-content.