How to add bookmarks to the top of a doc (like Slack channel bookmarks)

I love bookmarks in Slack channels. I want to create a similar collection of links/resources at the top of a Coda doc - similar in look to the subpages, but specifically to other resources like a Google Doc, a link to a specific item in a Coda table, and to a Slack group.

How can I create a similar collection of bookmark resources on my Coda doc?