How to show that small excerpt above Meta on WordPress.com like on your preview

Greetings. We are using your fantastic and sleek Editor theme on few of our WordPress.com blogs. But even after adding a manual excerpt, we can’t get it show above the Meta in the Meta column like it shows on your theme preview at: https://preview.arraythemes.com/editor/? How to fix this or is this feature available only in your self-hosted version?

Also, the linked name of the author is not showing on the top of each post in Editor on the home page on WordPress.com like in your theme preview. It is showing only in the single post pages. Again, how to fix this or is possible only in your self-hosted version?

By the way, when will your premium Medium theme become available for purchase on WordPress.com too?

Thanks in advance and awaiting your kind reply.