Hello,
You can re-write the code of Image editor in:
~\CMSAdminControls\ImageEditor\ImageEditor.ascxI am not sure how the button should work, however, you can add the custom code there.
If you need to display the teaser in the transformation differently, you can edit the transformation and add a
custom transformation function to display the teaser in a custom way.
Regrettably, we do not have any experiences in such an integration.
Best regards,
Helena Grulichova