Cards plugins feature

Following the great cards-mass that you have provided us with so many great cards, can we have it extended to have custom cards plugins?

Specifically the feature important here is the custom CSS for emails.

HTML snippets are only available for the website, but that Ghost cards have custom CSS for emails making them available for newsletters.

May we have it in either a cards plugin or as an extended version of the snippet feature or something like that - simply a default CSS and HTML splitter between web and email, derived from the same “te,plate variables”