Can I add CodeMirror addons to Grav Admin editor? (or possibly other solution)

I’ve noticed that soft hyphens (­) are shown in the Admin editor as little red dots, which I find really nice and handy as German is a language which absolutely does need optional hyphenation for smaller screens. I would love to have such an easy way to spot other special characters as well, most notably non-breaking spaces ( ) and double spaces (for Markdown line breaks).

There seem to be addons available that accomplish this for CodeMirror, Grav’s built in editor. I’m not sure however how I should go about installing them. Would that need a plugin? Or maybe it’s quite simple because there’s a config option somewhere?

As always, I really appreciate your help!