This was handy for a few folk, so I figured it’d be sensible to add similar functionality to my OEmbed Enabled embedded posts plugin for Known. The plugin will now attempt to use OEmbed to extract a representation of any Known post you link to into a rendered version.
Because allowing connections to just any OEmbed endpoint is a security risk, I’ve configured the plugin so that the Admin needs to whitelist domains/urls first (your current domain is automatically whitelisted).
Theoretically this could be used to whitelist non-Known sites that support oEmbed, although I’ve not extensively tested this so YMMV. Have fun!