JS+ CKEditor plugins themselves can be installed to any CMS or framework you want. But for Drupal 8 all the add-ons need to be wrapped with the Drupal compatible module.
We've prepared such modules. They will help you manage JS+ CKEditor add-ons inside CKEditor: to add/remove new plugins buttons to the toolbar and change all the options using UI in the administrator panel.
If you are on the purchase step, please choose CKEditor edition of the add-ons. Drupal modules are available on this page for free and will work fine in pair with CKEditor plugins.