I find when I export a page, blank lines to create spacing are just deleted. it doesn’t matter if it’s just a blank bullet point, or a shift-enter-created blank line.
Is there a way to preserve them?
The same question with you, I also want to preserve the blank lines.
If you get the method to achive this, please tell me. 
Turns out it works if you export using dashes, but not spaces or indents… I filed a bug report about it.