Pretty new to Obsidian, only 1 day (just heard about it yesterday for the first time). Pondering a move from Bearapp to Obsidian. Hopefully this will be helpful to you and others:
Set line height all lines to 1rem and add bottom padding to each line of 0.8rem.
Not really trying to mimic Bear, just learning at this point, and seeing what Obsidian can do. If there is an easier way to accomplish, please feel free to chime in.