can't force-insert vertical spacer or etc between subgraph title and content in live editor

[Ryder17z]

Is your feature request related to a problem? Please describe.
There doesn't appear to be a way to force a vertical spacer or linebreak or etc to exist between the title of a subgraph (might apply to other elements also) and the content in the live editor

This gets annoying on larger/more complex diagrams

Describe the solution you'd like
Make one or both of the following force-insert a vertical spacer:

• <br>
• \n

Describe alternatives you've considered

• \n and
  
• ---title--- block in a subgraph
• etc.

Additional context