Two empty spaces (or more) at the end of the line is the usual way in markdown, but not whether it works in every lemmy app since they all have different levels of markdown implementation but it should work.

Edit: damnit sorry forgot about the table part… No idea sorry :(

Edit 2: so I got curious and tried everything I could think of, and checked out what lemmy default web UI uses as it’s markdown flavour: “commonmark”, which doesn’t natively seem to support newlines in tables sadly.

Just noticed your edit before I wanted to mention about the line breaks, but wanted to say thanks for the cool and informative table!