Use case or problem
Insert internal note as text of the mermiad node.
graph TD A[[Christmas]] --> C (Go shopping) C --> [[Laptop]] C --> [[Car#Heading1]]
The node texts (Chrismas, Laptop, Car#Heading1)should be formatted as internal link, also when hovering on this text the note should pop-up as usal.
Current workaround (optional)
There is no workaround.