I think they're coming in 4.3 or 4.4. But most other fediverse software, including alternative Mastodon clients like e.g. Phanpy, already support quote posts.
Interesting! Though in this case Phanpy doesn't render the original for me either. Or do I have to make an account on their instance to make it work? https://img.sprovoost.nl/9f3e470b365cb2e0c9661208b5bf0f72fad5a42412824803702f84c3c914eaa1.png
Phanpy renders it inline, when you add the URL of another post to the content of a post. I guess the bridge doesn't do that. (There is no Phanpy instance, it's just a client for whatever Mastodon instance you want to connect to.)
It would look something like this: https://image.nostr.build/37d1839bf9af842aed6d5e5bdd4f4e0a4ea5113e10b2e732c9aca9991060a5b3.png