Thanks! I was trying to figure out how to do this. Unfortunately this doesn't seem to work with the graphtype flowcharts though it does worth with standard graphs.
Does this still work for anyone? The minimalistic example below does render a single A box correctly but nothing happens when I click on it on mobile (android) or desktop (macos). On desktop the mouse cursor becomes a clicking hand when hovering it, despite nothing happening when clicking on it.
```mermaid
graph TB
A
click A "joplin://3c8b261a3f314075b99128c4ecdfa202"
```