Template blocks for Articles and Comments

It would be nice to add an option to pre-define re-usable markdown supported blocks somewhere in the blog dashboard settings and enable the feature on the article composing sidebar to include them with a click of a button.

For example, currently, I have to cross-copy the footer for each article as it is identical in each article, and also I might foresee the potential use cases for the header.

Also, this would be handy for comments, so the user can pre-define different types of responses and avoid re-writing them each time.