Hello PlantUML team,

- Could you extend Mindmap
**Arithmetic [+/-]**notation syntax to allow multi-line nodes?

Examples:

Similar request here:

- https://forum.plantuml.net/11843/using-multiline-node-with-sided-mindmap-nodes
- https://forum.plantuml.net/14274/wish-the-nodes-of-a-mindmap-can-expand-for-several-lines?show=14276#c14276

Regards,

Th.