Inserting external items into the moderation queue

I have an external site for which I’m using my Discourse forum to handle SSO. That site has some user-editable parts, and everyone logged in will be logged in using their account from the forum. I’d like to be able to flag problem content the same way as happens in the forum.

Is there some way I can piggy-back onto Discourse’s moderation queue for this, say by programmatically inserting items into the moderation queue? I didn’t spot anything in the JSON API that would do this.

Any suggestions for other ways to handle this are also welcome.