Spellchecker in Plone 6, "Paid(?)" plugins in TimyMCE

Plone Support Customizing Plone
,
1

How do TinyMCE work with ‘paid plugins’ in TinyMCE?
My customer asks if I can add the ‘spellchecker’ plugin.
Will it work?
If yes, how do I set it up (in a profile xml-file if possible)

2

I have documented here how to implement the licensekey-manager plugin:TinyMCE customization — Plone Documentation v6