This is not possible with the way Lemmy is implemented, because each post belongs to exactly one community. This is not something we can realistically change. We are considering to show comments from different posts with the same url together, but that is controversial.
In any case NodeBB, Lemmy and Piefed are different platforms with different implementations and different users. So it makes sense that some features are implemented differently, or only available in a subset of platforms.






Lemmy 1.0 is backwards compatible with the current API v3. You can try it here. This uses the API from our test instance at voyager.lemmy.ml which runs the latest alpha version.