I would also love this feature. A friend of mine is on Goodreads, not on StoryGraph. I was telling her about a Reading Challenge and she asked me to share it with her so she can see what books I picked and decide which one(s) she would like to read with me.
It would encourage her (and other bookish friends) to join StoryGraph if this existed! (Obviously would be great to share my Reading Challenge books with those who are already on StoryGraph!)

Seconding this - I think the what people have added page is great as is.

But it would be good to have a way to see which prompts a specific person who you follow or all people you follow only have added. If there are a lot of books added to a prompt, you may want to see more trusted recommendations.

It'd also allow you to then click through and see their reviews.

Friends have suggested a link to a page which just shows which books they read for the prompts, in this case I believe they want to share to people who may not be following them or may not even be storygraph users (yet!). That could be nice.

Thanks for that feedback! You can see what other folk have added to the challenge from the prompt page itself, but you're right, you can't see who has added what yet!