AMP Stories allow you to attach additional content to a page as explained here.

Edit:
Based on the research and discussion on #2782 we should do the following:

• Create a custom block for Page Attachment.
• Replicate the looks of FE in the editor.
• Selecting the Page Attachment block in the editor would open it (the same way as in FE) and reveal the inner blocks.
• Add block settings for title, CTA text, theme.
• Allow just one inner block for now: post embed (search input, will store the ID)
• The embed will display either full content in cite or some selected data, e.g. title, featured image, excerpt.